# Questions tagged [truth]

Theories of truth deal with questions such as: what are truths? what makes them true? what is the relation between truths and the things that makes them true? Not to be confused with "what is the truth", which is a completely different matter.

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### How can we reason about "if P then Q" or "P only if Q" statements in propositional logic?

When you have a propositional sentence of the form P ⊃ Q  — which we might read as "if P, then Q" — how can you tell when it is true, or false, based on the truth-values of P and ...
273k views

### What is the difference between Fact and Truth?

I'm curious about the difference between Fact and Truth. I was searching on the internet if I could find it. But still I'm confused about the exact meaning. I first read the forum discussion here Fact ...
6k views

### Is everything just an opinion?

I read some people don't believe in truth but do believe there is always a chance that x. I have a question about such thought. I recently heard an anecdote that says nobody can ever prove I ate ...
810 views

### Is there modal logic without possible worlds?

Would it be desirable to carry out a deflationary research programme in modal logic? In other words, would it be desirable to re-think modal logic without the possible worlds semantics? The original ...
3k views

### Motivations for dialetheism?

At the request of the moderators, I've reformulated this question to change the emphasis of the question to something perhaps a little more broad-ranging: Question. What are the major modern ...
415 views

### Does Reality change when theory change?

I was going to include a caveat to prove a premise: to show that truth has become more subjective and then proceeding from older to newer theories of truth, I would cite a survey showing how ...
12k views

### Is mathematics truth? As in the sense of that which is manifest or possible in reality?

In mathematics there are imaginary numbers which cannot be represented directly in reality (the physical world). For example, you can't have i apples where i = √-1 (square root of -1) Can we ...
302 views

### Can my attitude kill you?

Indeed, it might be a basic characteristic of existence that those who would know it completely would perish... -Nietzsche Would it be morally reprehensible to tell a truth to someone if I know or ...
3k views

### Is scientism a self defeating epistemology?

Some who have argued against the validity of scientism have argued that the view that only science can uncover truth is not a scientific discovery but rather a epistemology. Hence it has been claimed ...
670 views

### Can there be true conclusions without assumptions?

I was thinking of the sentence "I think therefore I am", which I had for a long time considered indisputable because it's self-evident. Then I considered the hypothetical situation where my ...
318 views

### Is there a single definition of truth?

Is there a single definition of truth in philosophy? Seeing multiple definitions has inclined me to believe that there is no proper definition of philosophy that everyone can agree on.
266 views

### Ref request: Reality objective or subjective

This is a request for a reference on (within) philosophy.stackexchange.com. It follows from discussions around this question. I am asking after having tried my luck at websearch. What I am searching ...
14k views

### What are the philosophical implications of Gödel's First Incompleteness Theorem?

Gödel's First Incompleteness Theorem states Any effectively generated theory capable of expressing elementary arithmetic cannot be both consistent and complete. In particular, for any ...
12k views

### How do quantifiers work in predicate logic?

Predicate logic is somewhat like propositional logic, except that where propositional logic only works on the level of whole sentences (e.g. A = "Socrates is mortal", B = "All ...
3k views

### What makes Humans different from a chemical computer?

Are we all robots? Is our DNA the 0's and 1's of computer code? Are we an advanced computer system, with instead of keyboard and mouse input... input from our senses. Our database being our brain ...
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### Dynamic concept of "truth"

I've recently read a book in which a certain sentence sparked a question in my mind: "the Platonic philosophy is a search for truth, the certain truth. Such truth... is necessarily static" (...
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### Finding a clear difference between truth and fact [duplicate]

I have been starting back in school after a long hiatus. In one of my classes, a discussion of Truth began. The problem I have had is that no one seems to have a solid definition between the two. ...
734 views

### Shouldn't statements be considered equivalent based on their meaning rather than truth tables?

Consider the following truth table, which serves to define the logical connective ⇔, P | Q || P⇔Q T | T || T T | F || F F | T || F F | F || T According to the above truth table, the logical ...
371 views

### Is it ethical to research potentially harmful topics? [closed]

Some truths are very unpleasant. Some fields may even be unpleasant to research, because the researcher may wind up discovering something very disconcerting about the world. Should we investigate ...
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### Is it possible to prove that a particular statement cannot be disproved without creating a contradiction?

In the following link (http://www.importanceofphilosophy.com/Metaphysics_ExistenceExists.html) the authors are basically arguing that there are statements that we cannot deny without contradicting ...
486 views

### Are truth-claims inappropriate?

Strictly speaking, is it inappropriate to make a truth-claim? I am seeking an answer from Philosophy (Epistemology), and feel free to use logic I am speaking "theoretically", not "practically" I am ...
2k views

### Are mathematical statements necessary truths?

I apologize if a similar question has been asked here, but I haven't found it. Are mathematical statements necessary truths? By 'mathematical statements', I mean both mathematical axioms as well as ...
458 views

### How should we choose between different theories according to Rorty, based on Kuhn?

Popper tried to distinguish a scientific framework from a non-scientific framework ( like Marxism or Psychoanalysis, according to him) by suggesting the criterion of falsification. Kuhn suggested ...
246 views

### Can reason defend itself without resort to reason?

I recently read, "Reason can't defend itself without resort to reason." Is this universally true?
129 views

### A world where nothing can be hidden. No lies, always truth

In a Bollywood movie Pk, a man comes from a planet where lying is not possible as all the thoughts/knowledge is transferable via human contact. Due to which they do not have to lie about anything or ...
188 views

### Can we say that "I Think Therefore I Am" was never about "I", or thinking, or "I" doing the thinking?

Strictly speaking, "Cogito ergo sum" simply means: "The existence of your own mind can never be in doubt." Item 1) also describes our true knowledge in its entirety. Or we can ...
25k views

### What is the difference (if any) between "not true" and "false"?

A fairly simple question I hope someone can help me with.
6k views

### Does every truth have to be provable based on evidence?

I know the answer is "no" in general due to Gödel's Theory of Incompleteness, but I mean this question in a more real-world sense (i.e. scientific sense). In other words, I am talking about empirical ...
4k views

### When it is correct to use Tarski's undefinability theorem versus Gödel's incompleteness theorem?

Smullyan (1991, 2001) has argued forcefully that Tarski's undefinability theorem deserves much of the attention garnered by Gödel's incompleteness theorems. That the latter theorems have much to say ...
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### Why do I accept some inconsequential claims as "obviously true" without evidence? E.g. "Most people don't like to be hit on the head with a hammer."

There are certain claims that I accept as obviously true without (much) evidence. For example: Most people don't like to be hit on the head with a hammer. Donald Trump ate dinner some time last week....
3k views

### Why is belief necessary for justified true belief?

In justified true belief it is said that for a person to know a fact it must be true, she must believe in it and she must be justified in believing it. My question is: Is belief necessary? Why is the ...
278 views

### What is taken as truth in philosophy?

First and foremost I should say that I am not educated in Philosophy; I study Mathematics. Essentially, the job of a mathematician is to prove theorems by logical deduction from axioms, which are ...
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### Tarski's semantic conception of truth

Does Tarski's semantic conception of truth X is true if and only if p (where X is the name of a sentence, and p is the sentence itself) apply to all sentences or only to facts (understood as ...
3k views

### Can something be true if it does not follow logic?

Can something be true if it is not logical? Can something be true if it does not follow logic? if I can't deduce it logically? or if it contradicts logic? In other words: if someone says statement X ...
122 views

### What is the axiological basis of the preference of truth to falsity?

Axiologically speaking, why is truth the preferred logical value by humans? In general, why do we prefer true statements to false ones? What about the value of true makes a statement "right,"...
3k views

### Is the concept of “knowledge” important for philosophy?

I learned the definition of “knowledge” of justified true belief. I wonder whether it is important in any branch of philosophy? If I think about information per se, this boils down to technical ...
866 views

### Claims that we know (virtually) nothing - can they be refuted?

Here's an argument that I've heard a number of times from friends and on the Internet: "The ratio of what we know about the universe to what we have yet to discover is so small - it is therefore ...
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### Is there such a thing as a 'necessary truth'?

Wikipedia (note the redirect) defines 'necessary truth' as statements which "could not be untrue", and I assume that this is how the term is usually used. A search through the SEP shows that while ...
498 views

### According to St. Thomas Aquinas, do "being" (ens) and "truth" (verum) differ?

In his Disputed Questions on Truth q. 1 a. 1 arg. 3, St. Thomas Aquinas presents an argument against "that the true (verum) is exactly the same as being (ens)": 3. Things which differ conceptually [...
7k views

### Is finding truth possible?

Consider the following argument: If want to know that something is true, I need to first know what is truth. If I need to know what is true, I need to find the truth. (Is there ...
253 views

### Are extraordinary first-hand subjective accounts more likely to be true the more people report the same experience?

For illustrative purposes, let's take as an example the following claim X = "I went to sleep, but then I suddenly woke up at 3:00 a.m. feeling a terrifying evil presence, and then my bed began to ...
316 views

### Did medieval philosophers believe that Truth is causally active?

From the modern standpoint, truth is about propositions or beliefs. Getting true beliefs is not something that just comes to us by itself; evidence has to be gathered by us, we have to reason, ...
457 views

### The Truth-Falsehood Dichotomy and Logic

Some philosophers argue against truth bivalency, and say that not every statement must be true or false, but some statements can be untrue without being false, or truth-ambiguous, or both true and ...
10k views

### What is the difference between justification, truth and belief?

I have seen "justification", "truth" and "belief" used a lot in Crash Course philosophy and would like to know some hard differences between the three.
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### Why do we tend towards discretizing things around and within us?

Why do we tend towards discretizing things around and within us? Do our senses (for space and time) fool us into this notion all the way into the need for discretizing abstractions themselves, e.g. An ...
530 views

### Are there necessary truths in physical theories, more or less strictly speaking?

There are such things as mathematically necessary truths: 1=1, say; and logically neccessary truths: the law of modus ponens, say. But can there be one in physics? In Lewis's plural worlds where ...
844 views

### Why are negative facts more 'shadowy' than positive facts?

Source: p 268 Middle, Introducing Philosophy for Canadians: A Text with Integrated Readings (2011 1 ed).   Second, the theory doesn't satisfactorily explain what true beliefs correspond to. With ...
286 views

### Is it possible to prove the invalidity of logic without using logic?

Is it possible to validly invalidate logic without using logic? Mere assertion gives rise to the question, "How do you know?". At that point, you end up having to use logic to justify the thesis ...