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What would it mean to say that mathematics was invented and how would this be different from saying mathematics was discovered?

Is this even a serious philosophical question or just a meaningless/tautological linguistic ambiguity?

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Here is a headline from 2008: news.bbc.co.uk/2/hi/americas/7640183.stm Huge new prime number discovered I wonder who would say that this prime number was invented in 2008? –  GEdgar Jun 26 '11 at 2:41
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@GEdgar Intuitionists do not claim that individual numbers are invented - in fact an infinite number series is a principle of intuitionism. They would say that it became true that the number is question was prime. Prior to that, it was neither true nor false that it was prime. –  adrianos Jan 6 '12 at 13:54
    
My first reaction was "man, don't ask me a question like that", so great question...lol! But I would say it's BOTH! Certainly, there was imagination involved in the discovery and the unfolding of those processes relates to the spontaneity of genius in the establishment of reaching great mathematical solutions. –  Myron Moses Jackson Aug 15 '12 at 21:42
    
Just to make it clear: discovery = finding something that existed before (e.g., a frog, black holes) invention = intellectual creation (e.g., of a system) –  fubra Sep 25 '12 at 9:33
    
What we invent is called application. And what we find already existing is called discovery. Mathematics is the logic of understanding the facts through measures. Here measure is only a medium of understanding. So, I feel mathematics a discovery..........!!! –  Aneosh Nov 19 '12 at 19:10

25 Answers 25

up vote 67 down vote accepted

"Intuitionists" believe that mathematics is just a creation of the human mind. In that sense you can argue that mathematics is invented by humans. Any mathematical object exists only in our mind and don't as such have an existence.

"Platonists", on the other hand, argue that any mathematical object exists and we can only "see" them through our mind. Hence in some sense Platonists would vote that mathematics was discovered.

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Good enough for my upvote--I just want readers to realise these are specific schools of thought with defined characteristics. –  eMansipater Jun 7 '11 at 20:27
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True Platonists would argue that anything we learn is in fact remembered. This is the point of Socrates walking Meno's slave through a simple Euclidean proof about squares -- i.e., that through dialogue and introspection, our 'innate' knowledge (memory!) of mathematical Reality can be recovered in some partial way. –  Joseph Weissman Jun 7 '11 at 22:42
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I don't think this is a good answer. It reminds me too much of academic philosophers' evasive ism-dodges, i.e. when you ask them 'Does you argument fail because of X?' and they respond: 'Well if you're a Y-ist then no and if you're a Z-ist then maybe yes, but I'm not sure which one I am yet etc etc.' - The schools themselves mean nothing and people who haven't explored the issue independently should not, I believe, get told to look up a certain school of philosophy as their point of first contact –  Chuck Jun 9 '11 at 21:00
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@Joe: That's quite correct. Plato (via Socrates) held that we knew everything from previous 'afterlives' and that we remembered them, but thought we were learning something new. The passage with the slave boy sets this out very clearly. –  boehj Jun 13 '11 at 3:48
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Ok, good definitions; but what is your actual answer? –  Geoffroy CALA Oct 11 '11 at 23:03

My personal point of view is that mathematicians invented the axioms and the rules of operation, the rest are discovered. Mathematicians invented the notations for writing down the concepts which are discovered within the universe of an axiom.

The concept of numbers exists, but we invent the notation that the glyph '1' and the sound /wʌn/ refers to the concept of singular object that we discovered. We invented the rules of matrix multiplication, but the consequences of the way we do matrix multiplications are discovered.

Most of the time, we deliberately invent a set of axioms that will lead us to discover a set of facts we want to be true. This is certainly true with imaginary numbers, we invented them so that we can discover the solutions to problems we previously were unable or difficult to solve.

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why does the concept of number exist, but the concept of complex number invented? –  Artem Kaznatcheev Sep 12 '11 at 17:42
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@Artem Kaznatcheev: Good point. Complex number is just a notation for writing down a pair of numbers, we invented the rules of complex arithmetic so they can conveniently represents coordinates in a plane and a few common transformations. The concept of a plane and a point in plane exists, but the notation (e.g. complex number) are invented. –  Lie Ryan Sep 12 '11 at 21:15
    
one could also say that someone found that the particular set of axioms matched the intuition. –  Mitch Oct 11 '11 at 21:05
    
So mathematics is a collection of human invented axiomatic systems, notations and tools (such as the plane) used for exploring the logical consequences and concrete applications thereof? –  Alex Nye Oct 9 '12 at 22:17
    
@AlexNye: sorry for the late response, but yes you've got it right, spot on. –  Lie Ryan Feb 27 '13 at 16:20

There are things that are discovered, and things that are invented. The boundary is put at different places by different people. I put myself on the list and I believe that my position is objectively justifiable, and others are not.

Definitely discovered: finite stuff

By probablistic considerations, I am sure that nobody in the history of the Earth has ever done the following multiplication:

9306781264114085423 x 39204667242145673 = ?

Then if I compute it, am I inventing it's value, or discovering the value? The meaning of the word "invent" and "discover" are a little unclear, but usually one says discover when there are certain properties: does the value have independent unique qualities that we know ahead of time (like being odd)? Is it possible to get two different answers and consider both correct? etc.

In this case, everyone would agree the value is discovered, since we actually can do the computation--- and not a single (sane) person thinks that the answer is made up nonsense, or that it wouldn't be the number of boxes in the rectangle with appropriate sides, etc.

There are many unsolved problems in this finite category, so it isn't trivial:

  • Is chess won for white, won for black, or a draw, in perfect play?
  • What are the longest possible Piraha sentences with no proper names?
  • What is the length of the shortest proof in ZF of the Prime Number Theorem? Approximately?
  • What is the list of 50 crossing knots?

You can go on forever, as most interesting mathematical problems are interesting in the finite domain too.

Discovered: asymptotic computation

Consider now an arbitrary computer program, and whether it halts or does not halt. This is the problem of what are called "Pi-0-1 arithmetic sentences" in first order logic, but I prefer the entirely equivalent formulation in terms of halting computer programs, as logic jargon is less accessible than programming jargon.

Given a definite computer program P written in C (or some other Turing complete language) suitably modified to allow arbitrarily large memory. Does this program return an answer in finite time, or run forever? This includes a hefty chunk of the most famous mathematical conjectures, I list a few:

  • The Riemann hypothesis (in suitable formulation)
  • The Goldbach conjecture.
  • The Odd perfect number conjecture
  • Diophantine equations (like Fermat's last theorem)
  • consistency of ZF (or any other first order set of axioms)
  • Knesser-Poulson conjecture on sphere-rearrangement

You can believe one of the two

  • "Does P halt" is absolutely meaningful, so that one can know that it is true or false without knowing which.
  • "Does P halt" only becomes meaningful upon the halting of P, or a proof that it doesn't halt in a suitable formal system, so that it is useful to introduce a category of "unknown" for this question, and the "unknown" category might not eventually become empty, as it does in the finite problem case.

Here is where the intuitionists stop. The famous name here is

  • L.E.J. Brouwer

The intuitionistic logic is developed to deal with cases where there are questions whose answer is not determined true or false, so that one cannot decide the law of excluded middle. This position leaves open the possibility that some computer programs that don't halt are just too hard to prove halt, and there is no mechanism for doing so.

While intuitionism is useful for situations of imperfect knowledge (like us, always), this is not the place where most mathematicians stop. There is a firm belief that the questions at this level are either true or false, we just don't know which. I agree with this position, but I don't think it is trivial to argue against the intutionist perspective.

Most believe discovered: Arithmetic heirarchy

There are questions in mathematics which cannot be phrases as the non-halting of a computer program, at least not without modification of the concept of "program". These include

  • The twin prime conjecture
  • The transcedence of e+pi.

To check these questions, you need to run through cases, where at each point you have to check where a computer program halts. This means you need to know infinitely many programs halt. For example, to know there are infinitely many twin primes, you need to show that the program that looks for twin primes starting at each found pair will halt on the next found pair. For the transcendence question, you have to run through all polynomials, calculate the roots, and show that eventually they are different from e+pi.

These questions are at the next level of the arithmetic heirarchy. Their computational formulation is again more intuitive--- they correspond to the halting problem for a computer which has access to the solution of the ordinary halting problem.

You can go up the arithmetic hierarchy, and the sentences which express the conjectures on the arithmetic hierarchy at any finite level are those of Peano Arithmetic.

There are those who believe that Peano Arithemtic is the proper foundations, and these arithemtically minded people will stop at the end of the arithemtic hierarchy. I suppose one could place Kronecker here:

  • Leopold Kronecker: "God created the natural numbers, all else is the work of man."

To assume that the sentences on the arithmetic hierarchy are absolute, but no others, is a possible position. If you include axioms of induction on these statements, you get the theory of Peano Arithmetic, which has an ordinal complexity which is completely understood since Gentzen, and it is described by the ordinal epsilon-naught. Epsilon-naught is very concrete, but I have seen recent arguments that it might not be well founded! This is completely ridiculous to anyone who knows epsilon-naught, and the idea might strike future generations as equally silly as the idea that the number of sand grains in a sphere the size of Earth's orbit is infinite--- an idea explicitly refuted in "The Sand Reckoner" by Archimedes.

Most believe discovered: Hyperarithmetic heirarchy

The hyperarithmetic hierarchy is often phrased in terms of second order arithmetic, but I prefer to state it computationally.

Suppose I give you all the solution to the halting problem at all the levels of the arithmetic hierarchy, and you concatenate them into one infinite CD-ROM which contains the solution to all of these simultaneously. Than the halting problem with this CD-ROM (the complete arithmetic-hierarchy halting oracle) defines a new halting problem--- the omega-th jump of 0 in recursion theory jargon, or just the omega-oracle.

You can iterate the oracles up the ordinal list, and produce ever more complex halting problems. You might believe this is meaningful for any ordinals which produce a tape.

There are various stopping points along the hyperarithmetic hierarchy, which are usually labelled by their second-order arithemtic version (which I don't know how to translate). These positions are not natural stopping points for anybody.

Church Kleene ordinal

I am here. Everything less than this, I accept, everything beyond this, I consider objectively invented. The reason is that the Church-Kleene ordinal is the limit of all countable computable ordinals. This is the position of the computational foundations, and it was essentially the position of the Soviet school. People I would put here include

  • Yuri Manin
  • Paul Cohen

In the case of Paul Cohen, I am not sure. The ordinals below Church Kleene are all those that we can definitely represent on a computer, and work with, and any higher conception is suspect.

First uncountable ordinal

If you make an axiomatic set theory with power set, you can define the union of all countable ordinals, and this is the first uncountable ordinal. Some people stop here, rejecting uncountable sets, like the set of real numbers, as inventions.

This is a very similar position to mine, held by people at the turn of the 20th century, who accepted countable infinity, but not uncountable infinity. Those who were here include many famous mathematicians

  • Thorvald Skolem

Skolem's theorem was an attempt to convince mathematicians that mathematics was countable.

I should point out that the Church Kleene ordinal was not defined until the 1940s, so this was the closest position to the computational one available in the early half of the 20th century.

Continuum

Most practically minded mathematicians stop here. They become wary of constructions like the set of all functions on the real line, since these spaces are too large for intuition to comfortably handle. There is no formal foundation school that stops at the continuum, it is just a place where people stop being comfortable in absoluteness of mathematical truth.

The continuum has questions which are known to be undecidable by methods which are persuasive that it is a vagueness in the set concept at this point, not in the axiom system.

First Inaccessible Cardinal

This place is where most Platonists stop. Everything below this is described by ZFC. I think the most famous person here is:

  • Saharon Shelah

I assume this is his platonic universe, since he say so explicitly in an intro to one of his more famous early papers. He might have changed his mind since.

Infinitely many Woodin Cardinals

This is the place where people who like projective determinacy stop.

It is likely that determinacy advocates believe in the consistency of determinacy, and this gives them evidence for consistency of Woodin Cardinals (although their argument is somewhat theological sounding without the proper computational justification in terms of an impossibly sophisticated countable computable ordinal which serves as the proof theory for this)

This includes

  • Hugh Woodin

Possibly invented: Rank-into-Rank axioms

I copied this from the Wikipedia page, these are the largest large cardinals mathematicians have considered to date. This is probably where most logicians stop, but they are wary of possible contradiction.

These axioms are reflection axioms, they make the set-theoretic model self-simialar in complicated ways at large places. The structure of the models is enormously rich, and I have no intuition at all, as I barely know the definition (I just read it on Wiki).

Invented: Reinhard Cardinal

This is the limit of nearly all practicing mathematicians, since these have been shown to be inconsistent, at least using the axiom of choice. Since most of the structure of set theory is made very elegant with choice, and the anti-choice arguments are not usually related to the Godel-style large-cardinal assumptions, people assume Reinhardt Cardinals are inconsistent.

I assume that nearly all working mathematicians consider Reinhardt Cardinals as imaginary entities, that they are invention, and an inconsistent invention at that.

Definitely invented: Set of all sets

This level is the highest of all, in the traditional ordering, and this is where people started at the end of the 19th century. The intuitive set

  • The set of all sets
  • The ordinal limit of all ordinals

These ideas were shown to be inconsistent by Cantor, using a simple argument (consider the ordinal limit plus one, or the power set of the set of all sets). The paradoxes were popularized and sharpened by Russell, then resolved by Whitehead and Russell, Hilbert, Godel, and Zermelo, using axiomatic approaches that denied this object.

Everyone agrees this stuff is invented.

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+1 I hope someday I can answer questions with such completeness. –  Vladimir Putin Aug 29 '12 at 4:13
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@RonMaimon: While you give lots of examples, I still don't understand how you decide which parts of mathematics are invented and which are discovered. It seems to me that the rule is "things I'm comfortable with are discovered, things I'm not comfortable with are invented", I would never consider that to be objectively justifiable. Compare with my answer, in which I give the straightforward rule: "axioms and notations are inventions; consequences of those axioms are discovery". –  Lie Ryan Feb 26 '13 at 12:41
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@LieRyan: Things that have an invariant computational description are discovered, things that are produced from idealizations that are beyond any computation, so that their properties can be changed in different models, these are invented. It's the computational foundations, and it's the only reasonably objective answer, at least since 1936 when computers became available. Your answer is not good, because computers are invariant to axiomatizations, all reasonable axiomatizations give the same notion of computer. So computers are discovered for sure, and I'm saying that's all. –  Ron Maimon Feb 27 '13 at 12:20
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@LieRyan: Ok, I sort of agree with you, but the issue I have is that the statement "mathematics is about axioms and deductions" is clearly true, but it doesn't explain how you select axiom systems for importance, or why different axiom systems end up being equivalent, or why the axiom systems naturally form a tower of increasing strength, indexed by countable computable ordinals which form the proof theory of these systems. I think these insights are more important, but at a more basic level, you are right, and I can't complain too much. Thanks for the comments. –  Ron Maimon Mar 2 '13 at 3:01
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This and Lie Ryan's answer are the only upvotable answers in this entire thread. The rest are just comments, or blabbering. –  dimension10 Nov 16 '13 at 2:59

This is only a partial answer:

As a mathematician, I have been asked this sort of question from time to time. Like most other mathematicians, I tend to sort of evade the question, because it's tricky. Usually, the question is put in the form, "Are you a platonist?"

The reference here is to Plato's eternal form that we are able to recognize, and that allows us to recognize the world around us (it is not obvious, afterall, that we should still be able to recognize an amputee as a human when we first see him or her, for example). When forced to continue, I usually respond "No."

I think the fundamental problem with Platonism is summed up in Brian Davies's paper, aptly titled "Let Platonism Die." I also add - if a mathematical 'discovery' hasn't yet been discovered, does it exist? A Platonist would say absolutely. An intuitionist would either say that it does not exist, or it exists only in the sense that some current or future mathematical system, devised and formulated vulgarly by humans, will lead to many more theorems - i.e. it exists only as an extension of what we have already created.

But ultimately, I don't think that this distinction is very important aside from the theistic or neural implications. A Platonist would say that when we recognize a triangle, for example, it is because we are recognizing the Form of a Triangle, some idealized, perfect, transcendental object. This makes a lot of sense, because Platonism obviously has at its roots Plato, who read much into the divine relationship between mathematics and the world espoused by Pythagoras.

As a final note, I should say that many well-known mathematicians lie on both sides of the fence. The most famous Platonist, I believe, is Roger Penrose, who is most famous for his creation of dozens of non-obvious tessellations and tilings.

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OK, I try again: "I also add - if a mathematical 'discovery' hasn't yet been discovered, does it exist? A Platonist would say no. " Really? No? I though a platonist would say that it does exist before it has been discovered. –  Lennart Regebro Jun 7 '11 at 20:47
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@Lennart! WHOOPS! Thank you. I'm changing it immediately. –  mixedmath Jun 7 '11 at 20:47
    
Nice answer. Since you named a platonist you could also name an intuitionist, for example V.I. Arnold who once wrote that "mathematics is the part of physics where experiments are cheap". :) –  Michael Oct 4 '13 at 17:18

I think the words "invention" and "discovery" are a bit poor to describe the birth of mathematic if there is one. It makes no sense to me to say mathematic has appeared as when Christophe Colomb discovered America or was invented as the boomerang.

The word mathematics might have been invented, the language in which the mathematics are written might have been invented but the abstraction movement from the real word, the structured synthesis that it undertakes, all that give thickness to mathematics themselves (it depends what you call mathematics) are part of mankind. You don't ask if beauty has been discovered or invented ?

My personnal point of view is that the question "what is mathematics" would be more serious, I would found even more interesting "why do we do mathematics".

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Mathematics is an abstraction. As such it is invented by humans to deal with concrete things is a more practical manner, by giving us generic tools to deal with the specific.

Later more mathematics was invented to deal with the abstractions of earlier maths, leading to more and more complex abstractions, but the invention of math was done to deal with concrete things, like geometry and trade.

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Topics in advanced number theory, non-euclidean geometry, Kolmogorov complexity and many other branches of mathematics were certainly not invented as a way to "deal with concrete things in a more practical manner." –  Ami Jun 7 '11 at 20:22
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@Ami: Fair enough, some of them where invented to deal with abstract things (namely other maths) in a more practical matter. But those abstractions are done to handle other abstractions which in the end are there to deal with concrete and complex matters. (Non-euclidean geometry does have many extremely directly practical applications though. Maps of earth, for example). –  Lennart Regebro Jun 7 '11 at 20:28
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Mathematics is also highly related to aesthetic concerns, which don't necessarily have to do with concrete things. Music is highly mathematical, and there are many other examples as well, so I don't think it's accurate to view mathematics as entirely an abstraction about concrete things. –  eMansipater Jun 7 '11 at 21:39
    
@eMansipater: 1. Music is highly concrete. 2. It was about the invention of mathematics. It was invented to deal with concrete things. –  Lennart Regebro Jun 7 '11 at 21:49
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-1: For reasons explained by eMansipater and Ami. –  Q__ Jun 11 '11 at 17:57

Mathematics is a lot of things: there are basic/complex entities/structures, proof strategies, algorithms, formal manipulations... in order to try to answer your question I think we should make some distinctions between different matematical entities/activities where the "creative" part of the thought is more or less relevant. Moreover some parts of mathematics seems to be neither discovered nor created, they seem to be just "given" embedded in our natural language grammar.

Some examples of math entities/activities that:

  • seem embedded in our grammar: classical logical operators, classical deduction rules, tautologies, natural numbers
  • seem more discovered: non-trivial general fact in a given structure (ex. fermat's last theorem), finding general patterns, classifications, finding counterexamples
  • seem more invented: definition of new non-trivial structures (ex. complex numbers, quaternions), finding new non-trivial proof strategies.
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I'm going to posit, admittedly without any research whatsoever about those who've preceded these thoughts, that an "invention" is a kind of "discovery," and that whether a thing qualifies as an invention is—yup, you saw it coming—subjective.

For example, we might say that the wheel was "invented" on grounds of (1) non-naturality (originality), and (2) intention. That is, prior to the wheel, circle-and-axle forms did not exist in nature, and so of course no one could apply it to the facilitation of movement. Furthermore, it's hard(er) to imagine someone carving a circle with a hole, then carving a spoke, then putting the two together, without having the intention of rolling the circle on the spoke, in mind. These circumstances give us cause to say that the wheel was "invented."

But, it's not impossible to imagine, either, that someone might have carved a circle with a hole for absolutely no reason to do with the concept of rolling, then happened to stick a stick in the hole (again, for no premeditated or relevant reason), and only then (or sometime later) realized its property of rolling. Note how in this case, we're more inclined to call the wheel a "discovery!"

I think we tend to call novel discoveries with premeditated results, "inventions."

So, I would say mathematics, as a general notational/deductive system, was mostly invented. But its concepts were discovered. (And even some notations were indeed discovered, while striving for convenience, concision, and pictorialization!)

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Both.

Formal mathematics is created by people, and doesn't necessarily relate to anything in our world.

However, the history and progress of mathematics is many times related to applied mathematics, which is related to our physical world.

In other words - geometry will remain valid even if we will find out that it doesn't hold true for our physical world (and actually, it doesn't...) - But it's hard to believe many people would have started researching this field as a pure abstract field, with no relevance to real problems of construction, navigation, etc.

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First, Quine: "..[If externally true] the definitions [of mathematical laws] would generate all the concepts from clear and distinct ideas, and the proofs would generate all the theorems from self-evident truths." "...the truths of logic are all obvious or at least potentially obvious..[but] mathematics reduces only to set theory and not to logic proper." -Epistemology Naturalized; Chapter 39.

The implications are bleak for the ontological objectivity of mathematics. For a fact to reduce to certainty one must present sensory evidence (to be "self evident"). Consider, I see that things fall to earth and stay there. I explain this to myself with physics. What I see is not physics. Physics is a framework invented to generalize what I am perceiving.

A 1 and a 1 on a sheet of paper are not the same as a 2 on a sheet of paper. 1 is the smallest prime#, for example, while 2 is the smallest even prime, among myriad other differences.

An apple on a table and an apple on a table is not the same as two apples on a table, as the set of two apples could be different apples. I cannot cube two apples, except to make pie. But I cannot make pi with an apple.

The value of a dollar is measured mathematically. But if humans disappear, the piece of paper remains, while the value disappears with humans. Things stick to the earth regardless of our existence, but the theory describing our perception of gravity does not.

The epistemic objectivity of Mathematics is ontologically subjective. It exists only in our minds. Something that exists only in our minds can only have come into existence within our minds. Something that does that is invented.

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If by "was it discovered?" you mean "was it there all along?," I think the answer is "yes." Consider that we can use math to "predict" the past ("retrodiction"). A similar concept is "hindcasting," where the validity of a scientific model is tested against data that was recorded before the model was even invented. Presumably, in order for retrodiction/hindcasting to work, the mathematics had to be there all along, constraining the evolution of the universe. If you buy this argument, this suggests that mathematics was there all along, or "discovered."

Of course, other definitions are possible.

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I think it's hard to say. If you believe that mathematics has been discovered, you must assume that "something" is out there, something we can interact with, of which we have been unable to prove existence so far.

However, even assuming that there are ideas out there, I believe that there is no reason to think that humans should be, in any way, able to understand them. As David Deutsch famously said, the fact that we understand the laws of Nature, is pretty much like saying that you land on another planet, and find aliens completely able to speak to you in english.

Last but not least, it is possible that our models of how the Universe works are completely wrong. Hence, we are talking about ideas derived from our models that may be, ultimately, way off the truth.

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My view on it is that Mathematics is a system invented by humans to represent things we otherwise can or cannot perceive. For example, we can perceive an object through vision and know it's a triangle, however, our vision alone does not tell us the length of the legs of the triangle. We need math to represent that for us.

JUst to further my point, consider Calculus. Two people who were on completely different sides of Europe, Leibniz and Newton, created a system that that both do the same thing. For Newton, f'(x) is the same as Leibniz' df/dx. Both of them yield a function that represents the slope at any given point on the original function, f(x). They invented a system to represent something we otherwise couldn't perceive (which was pre existing - The shape of a mountain should be enough to prove that the slope exists naturally), the only difference was their notation.

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Newton didn't use function notation (f'(x)). Newton used geometric demonstrations in his Principia. (Look at "Lemma 1" in the Principia.) He built on Archimedes's method of exhaustion (a method that Galileo used as well, think of his infinitely sided polygon, i.e. the circle). Whereas, it might be said that Leibniz's notation came about through his interest in summing infinite series. His approach is radically more concise than Newton's--but Newton purposefully didn't use a different form of notation (from that of Apollonius) because he didn't like how ungrounded calculus was. –  Jon Nov 8 '11 at 20:23

Mathematics is normative. That is clear when one reads Euclid and Lobachevsky in juxtaposition, or Euclid and Descartes, or Euclid and Leibniz or Newton, or Leibniz and Newton and Dedekind, or Dedekind and Canton, or Canton and Godel, etc., etc.. Geometry is clearly normative, as we have different geometries (although one might claim, "yes, but they can all be transformed into one another"). But the argument goes like this: there is no other arithmetic; and thus, in counting (and its extensions), we are discovering something fundamental to the universe. Of course, such an answer supposes that Euclid and Dedekind are talking about the same arithmetic. Is that even possible? No. There's no room, in Euclid's conception of number (think of Books V and VI of the Elements), for Dedekind's cuts, and thus, no room for a whole host of numbers that are incompatible with Euclid's concept of number. And if you think that the concept of number is fundamental to a conception of arithmetic, then it would seem that every time we "add" new "sorts" of numbers (which are invented by new sorts of functions), we create a new arithmetic. But, someone might say, "that's all well and good, but we really just subsume those other arithmetics under what we call arithmetic--there's really just one arithmetic." But that would be like saying "wave-mechanics really just subsumed ordinary mechanics...." Such a statement doesn't make any sense.

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In line with many others' probing at just what 'invented' means, invention and discovery can be viewed as the same thing, as both require the application of a set of steps along with various objects under consideration. Even when discovering, say, a continent, the notions of continent-ness and America-ness are both inventions, nonetheless. And even when inventing, say, the internal combustion engine, the laws of physics which allowed such a device to exist were in place before the invention, and thus the particular arrangement of parts which effects its existence was discovered.

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If only we would get the question right, we may be able to get the right answer. The problem is, is invention discovery or creation? As a seven times patented inventor, I will tell you that invention is, at least to a great extent, discovery. As my patent agent explained, what is invented is a "method", a way of getting a job done. During the process of invention, one tries on a gazillion methods of getting the job done that don't work. When one does discover a method that does work, well, one has an invention.

The proof of discovery verses creation, is the proof of reproduction. When a person who has never seen a wheel before tries to solve the problem of causing heavy objects to move, he may very well re-invent the wheel. This happens all of the time with inventions. One comes up with a method of solving a problem, only to discover that someone else has patented that invention before him. Creativity is not like this at all. If two people truly independently come up with the same creative product, then their creative product is, well, simple. In fact programs are used to analyze college papers for plagiarization. They seek matches in a 7 word sequence because it is unlikely that two people independently come up with seven little words strung together the same way.

So let the question be, "is mathematics discovery or creation?" Ask the anthropologist to seek out the mathematical methods of other cultures. Surely these methods would be extreme subsets of our math. However, they still have some simple consistencies. Two plus two (though represented with different words) equals four. The fact that two cultures independently come up with the same logic sets establishes that mathematics is discovery, not creation.

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I like your reasoning here, but it only works for very simple kinds of mathematics. When we start getting into areas like trigonometry and real analysis, it's plainly not right to say that different cultures came up with these things independently - rather, methods moved from country to country as people from different cultures traded, fought and explored with each other. –  Paul Ross Sep 11 '13 at 6:37

This is a serious question and it is the same as saying: is the knowledge in mathematics universal or a human construct?

Pi (the number, regardless of its base) and many other things are universals, mathematics are discovered to that extent. Then they can be used to formalise inventions that may prove to be wrong, right or paradoxical, in the same way the knowledge (discovered) about horses and rhinos can be used to (invent and) speak about unicorns (that were never discovered).

Can we say (as many answers point here) that biology was invented because of unicorns?

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I like this answer. Humans invented the wrong stuff, the rest is discovered. Apart from being funny, I think you've nailed it :-) –  user2808054 Aug 4 at 15:02

Mathematics was invented as a means of expressing numbers, relations, etc. while the laws of mathematics were discovered.

Pi is Pi, whether you like it or not. It's value was discovered. However, expressing Pi in base-10 decimal notation as 3.14* (or 22/7 if you're that type of person) is an invention of the human mind, whereas the actual ratio was such from the beginning of time.

In short, mathematics is a human invention to better understand and to discover how the natural world operates on a purely logical level. One needs to separate the method from the observed.

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A little bit of both. One invents the mathematical concepts, and then discovers the consequences of these concepts. Something like "define lines and points via axioms, and then discover triangle properties."

Then one wish for different consequences and invents new concepts, something like "I wish triangle had sum of angles over 180 degrees; let's define lines as great circles on the sphere instead of lines on a plane and see what happens."

And it goes on and on, invention hand in hand with discovery.

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Math is a system made up to quantify, measure, understand, and determine things by mathematical proof, logic, analytical reasoning, and common understandings. It's also an abstraction as well since the actual theoretical basis given on the implementation of the something will usually differ in practice atomically, etc.

Math is an endless study of conjectures that is agreed upon by people subscribed to such a phenomenon. Math has been used for centuries to keep track of things, measure qualities of things, and in modern days to analyze and interpret highly complex conjectures, theories, and explanations of everything around us.

Was it invented or discovered? Philosophically speaking, is anything ever really measured or discovered?

Somethings just are, and to our best knowledge we have a system, math, to quantify and analyze things.

Math never "was" anything until it was agreed upon, brought in to use, and implemented, agreed on, and understood. Such highly complex systems never were used by the biological creatures way before us, e.g. fish, bacteria. Quantity is just mass without numbers, and quality is just coincidence without observation.

A response to another question I found here that spiked my interest:

why does the concept of number exist, but the concept of complex number invented?

The concept of everything tangible and/or intangible only exists to be understood based on the reality and observation of the phenomenon around it, how those phenomena perceive it, agrees upon understanding it, and how well that system can accurately model the underlying reality of it. To a human a ball is something you kick, throw, catch, has shape, mass, volume; to a dog it's something in its way. The reality is that if there's a reality under the underlying concepts we try to figure, only such a system invented will try to emulate the process of understanding it more and more.

The question also touches on the grounds of everything around us, and its totality. Let me give you an idea of why I am proposing that math is an invention:

Before people could even count, or even existed there were always many different biological structures, masses, gases, inanimate objects, and collective existences outside of a singular model, single perception of electromagnetic radiation's visible light, eyeballs, brains, or classification itself. Before we evolved did dinosaurs, assuming you believe they existed, count and classify the world around them? Probably to a mere, limited extent, but not anywhere near how most people would think of it. All biological creatures that have evolved past the bacteria have gained perception, analyical minds, and the capability of complex thinking to become better suited to the existence to around them. None of them ever came anywhere close to modern humans.

I doubt the fish in the sea can accurately model multiple perceptions of visible light on masses, and use their brains to visualize this as two separate objects, thus, manipulating the abstraction of items, beings, or existences around them. However, we look at two things and agree these are two things. We see two rubber balls on the floor, and we come to the immediate conclusion that they are two distinct objects. But are they really two things, or have you just subscribed to a common method to segregate objects based on human evolved, educated, or brain limited rules?

Point is, you see two non-connective items, and you classify/label them as two. You aren't, in most cases, visualizing the ball as a synthetic base of polymers, isoprene, and other chemical elements and masses that constitute its existence within electromagnetic radiation in an atmosphere. Therefore, you have classified the existence of two balls based on segregating instances of light, however, you are only using a system to do so that is 100% limited to your brain's understanding.

Without a system, understanding, or method of perception everything would exist, but would not be calculated, observed, or manipulated.

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Fascinating question and thread.

Layman's thoughts: Mathematics is a system for observing what we percieve to be the real world.

It's basically about counting, whether it be carrots, pixels, kilograms or light years.

I have two carrots. I now add two. We now say there are four. This is just a re-arrangement of some objects - the fact that we're counting them with numbers is a human notion. Really they're arranged in sets.

Four carrots. I want to feed three people so I multiply by three.

Multiplication at this point seems like an utterly human invention. Was multiplying sitting there waiting for me to discover it ? No, I had to invent the notion myself- ie, come up with the formula that in order to feed three people I need to multiply the contents of one person's (slightly disappointing) meal by three. The most basic way of doing this would be to create a meal for one, then do the same for a second person, then the same for a third. That's three people's meals. No multiplication or maths- just things arranged in a place.

I think what we've done with maths is invent a system which accounts for what we currently observe to be the case. But with all observation, it's only good for demonstrating a norm.

However it works so well it 'feels' like it was always there waiting to be discovered.

I guess the nub of it is:

Will 1+1 always equal 2?

If you define two as being 1+1 then yes it will - but then 2 becomes an abstract notion which we've just invented (clue's in the name..)

If you define 2 carrots as what happens if you put one carrot next to another, then the behaviour of the carrots determines whether 1+1 = 2. Suppose they're a new type of carrot and they cancel out ? Then 1+1 = 0, so no.

I think Maths is an invention, but seemingly a pretty safe one

go on pull me apart lol :-)

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I didn't personally downvote your answer, but I noticed whoever did neglected to offer you any feedback, which is unfortunate since you seem new and eager to contribute. So here are my thoughts. Generally speaking, the StackExchange Q&As are intended as forum specifically for answers above the layman level since there are so many other venues on the web (e.g. yahoo answers) that suffice for layman responses. This is a place for finding useful, reliable answers quickly, not sharing and discussing opinions. You're answer may have been dv'ed for this alone, so you shouldn't take it personally. –  David H Oct 16 '13 at 19:06
    
(part2) A rule of thumb I go by when decided whether or not to offer "layman responses" of my own is to first go over the corresponding Wikipedia article (if it exists) and assess how much info there I already knew. In your case for instance, I feel if you had read the Mathematics beforehand, you would have seriously reconsidered almost everything you wrote. Mathematics is NOT just about counting. Counting/arithmetic is just one example (and historically the first) of making rigorous deductions about abstractions and their representations, i.e. math. –  David H Oct 16 '13 at 19:16
    
Ia am indeed new, and thanks loads for the advice. –  user2808054 Oct 23 '13 at 10:42
    
I am indeed new, and thanks loads for the advice - duly noted. Re wikipedia/maths : I take your point, but the implication is that there is a correct answer, and I should research the internet to see what everyone else thinks then regurgitate that. Damn me for thinking for myself. Perhaps I'll just read this forum for a while and get used to the style of answer before chipping in again. I appreciate the comments though, thank you –  user2808054 Oct 23 '13 at 11:17

My elementary math lecturer likes to say

God created the number 0, and the successor. The rest was invented by mankind.

I think there is some truth in this quote, even if you don't believe in God. So to answer your question: I'd say that the very basis of math was discovered, but most of the sophisticated math was invented.

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Discovered, if it was invented, then whoever came up with π in theory could have just made it equal 3, but instead they discovered it, and that it was an irrational number. The math was discovered, but the different techniques and conventions used for calculation were invented. Kind of like, Physics; the laws of physics already existed, but man has discovered how to use them to their advantage with their inventions.

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The Black-Scholes equation describes the price of a stock option over time. Since the concept of stock options, financial markets et cetera were invented, not discovered by humans, does that suffice as an arguement that mathematics was invented? If there was no such thing as a stock option, there almost certainly wont be the black-scholes equation. The black-scholes equation would never be out there waiting for us to discover it if there was no such things as a stock option.

If one claims that although a stock option was invented, the black-scholes equation can be said to be discovered, how many more mathematical theorems, equations, models and so forth are out there that are waiting to be discovered, dependent on our future "inventions and creations"?

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Neither, it is understood. You are mathematics, everything you experience is mathematics, everything you think you know is mathematics. Your brain is an intricately connected computation machine which gives rise to all of your experiences and to your sense of self. Mathematics is the ability to predict the future; it is the ability to remember the past.

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Very beautifully put, but I disagree, and as this is nothing but your opinion (as it currently stands), we have to agree to disagree. –  iphigenie Jan 17 at 18:12
    
@iphigenie It is a statement of fact. Consider the Cybenko theorem which proves that a rather simple artificial neural network, a computer coded approximation to the way our brains function, has the ability to reproduce any continuous function in $\mathcal{R}^n$. –  Chris Mueller Jan 17 at 20:09
    
It is not a fact, otherwise there would not be an ongoing philosophical debate about it. Welcome to philosophy.se, you can't just claim to be stating objective facts. –  iphigenie Jan 18 at 11:03
    
@iphigenie Lol, this is your definition of a fact? What if I told you that electromagnetic waves travel at the speed of light; is this simply opinion because the philosophers aren't debating it? It truly is a fact that your brain is a computation machine. It truly is a fact that mathematics, through natural law, allows us to predict the future. It truly is a fact that modern digital memory is based on the field of binary mathematics. It may be my opinion that "everything you experience is mathematics, everything you think you know is mathematics", but I don't think it is such a far leap. –  Chris Mueller Jan 18 at 15:04
    
The brain might be a computation machine, among other things, but that doesn't automatically mean that it "gives rise to all of your experiences and to your sense of self". THAT is not a fact, and, unlike your other "facts", this is a philosophical claim, which isn't undisputed. That's my point. –  iphigenie Jan 18 at 15:07

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