Truth has long been a central subject in philosophy. Theories of truth deal with questions such as what truths are, what makes them true and what is the nature of the relation between them.

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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 ...
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Is truth telling important or just having good intentions is enough? [closed]

Are good intentions enough to warrant not telling the truth? I am especially interested in when we've already lied, and the point in question is whether we should confess. Do any philosophers write ...
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Truth Value of Sentences Containing Logical Contradictions

Do propositions containing logical contradictions have truth values, or are they meaningless? For example: A) Some married bachelors exist. B) 95% of married bachelors live in Maryland. C) ...
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Self-referring propositions

This proposition is false As you can see in the proposition above, there is a problem. This sentence can't be true, but it can't be false either. I believe that this issue comes from the fact that ...
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To Check or not to Check? [closed]

Samuel and Paul make a wager. They want to know if a certain professor held class the day prior when they were absent. The professor is unreachable, though, so they have to ask students from class. If ...
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Why does what I've written fail to define truth?

(Also posted in mathstackexchange prior to this). I stumbled across a set of axioms for first order logic a bit ago. Intrigued, I decided to try to write it all down and organise what I read. After I ...
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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 ...
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Tarski's original proof of the undefinability of truth

I'm trying to understand Tarski's proof of the undefinability of truth as given in his paper The Concept of Truth in Formalized Languages (English translation in Logic, Semantics, Metamathematics, ...
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What is the nature of pragmatism as a claim? Can pragmatism ever be understood as a claim in light of its own conditions?

Pragmatism is the suggestion that truth-value and meaning should be talked about in terms of the way we use those terms. All such talk should be hashed out in terms of the practical bearings of such ...
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Are all self-evident truths necessarily redundant?

Every justificationist theory of knowledge has axioms and premises that it begins with. This fact has led skeptics to criticize the possibility of knowledge by noting the infinite regress within any ...
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What makes a relation 'satisfactory' under William James's pragmatist account of truth?

William James wrote that "Ideas ... become true just in so far as they help us to get into satisfactory relations with other parts of experience" (James 1907). What makes any given relation more '...
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Is there a way to avoid Gödel incompleteness affecting mathematics as a whole?

I have been thinking about Gödel's incompleteness theorems and their ramifications for the whole of mathematics. In this question I assume some fixed formal system F expressive enough for the ...
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Is the claim that atheism is the null hypothesis invalid because it applies a physical measurement to the metaphysical?

I've heard several people state that: Atheism is the null hypothesis. ie that this null hypothesis can be falsified: if one piece of evidence is found to contradict it, the existence is considered ...
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If “All S is P” is true, does it contradict “No non-S is non-P”?

I have a problem I encountered in a logic textbook that I cannot figure out after multiple tries. Say we assume that "All S is P" is true. Does this allow us to conclude the truth value of "No Non-S ...
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138 views

Can we have knowledge if it all turns out to be untrue?

Can every apparently true belief turn out to be untrue: and what is the word for this stance? I would assume it would mean we have no knowledge: is that right? Someone on a forum I use keeps ...
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Can reason defend itself without resort to reason?

I recently read, "Reason can't defend itself without resort to reason." Is this universally true?
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Can the correspondence theory of truth really be completely avoided?

Let us assume that 'truth' is a construct of the human mind. In this case truth is defined as some product of the mind's 'verification', and nothing else. What 'makes' a statement true is simply the ...
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How Can the Unobservable be Verified?

Empirical evaluations and judgments concerning the observable world (e.g. whether or not I'm eating a watermelon right now) are evidently verifiable; you can confirm that I am indeed eating a ...
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Are there exceptions to the principle of the excluded middle?

It is inherent in our truth tables that we configure a statement to be either true or false, but it seems that this might have certain exceptions, especially in conditionals. For example, the ...
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Is there an approach to modal logic without Lewis's axioms and 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 Lewis's axioms? possible worlds semantics
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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 ...
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Is Tarski's theory of truth compatible with intuitionism?

Intuitionistically, truth is identified with provability: A is true means that it is possible to prove A. In his essay "Intuitionistic logic a philosophical challenge, Logic and Philoshophy" (1980) ...
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Is “Truth” something like a Dirac Delta Function?

To me, Truth is simply what is the case. It is not a matter of reasoning, and it could not be otherwise. Knowledge is a set of beliefs which accord with reality (what is true). Beliefs can be false. ...
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Granted Hume's psychological perspective regarding impressions and ideas, doesn't this make his epistemology obscure?

Hume held that all that was meaningfully present to the mind consisted in matters of fact (impressions) and relations of ideas. But even ideas were faint impressions themselves, formed over time by ...
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What is the difference between real and nominal definitions?

What is the difference between real and nominal definitions? Is it philosophically accurate to say that real definitions (as opposed to nominal definitions) can be true or false? Take for example, ...
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What is the relation between proof in mathematics and observation in physics?

Recently in his 2015 Hirzebruch Lecture in Bonn, Arthur Jaffe re-amplified his famous perspective that finding proof in mathematics is analogous to making experimental observation in physics. In ...
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What is the philosophical difference between “Reality” and “Truth”? [closed]

While talking philosophically, I want to know the difference between Reality and Truth. Especially while Asking this question, I've used Reality/Truth because I don't know How they are different in ...
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Why might truth imply necessity?

It seems well established (or, well-accepted) that necessity implies truth. For instance, in a context of epistemic logic, if one knows A, then A is true. On the other hand, I found on the Internet ...
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Using the conception of 'reliable, unchanging' does 'truth' exist?

An 'archaic' definition for TRUE,TRUTH implies constancy, reliability, unchanging, fidelity. Using this concept of TRUTH is the following valid? There exists either that which is TRUE or that which ...
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Why does one need 'proof' that God exists - What constitues 'proof'?

Does something need to have proof demonstrated for it to be true? If I say "I love my wife!" but you don't buy it... does that mean it is not true?
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How does strong evidence imply truth?

I have seen a great number of individuals who take a step from "There is overwhelming evidence to suggest theory X is true" to "Theory X is true." (I think I misworded the former sentence ...
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Truth and wavefunction [closed]

Well to be honest, my major is physics. And I only started some low level philosophy recently. So please criticize my opinions so that I can advance more quickly. :-) My problem started with Russell'...
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219 views

What are Nietzsche's views on truth and logic - for real this time

I'm trying to make sense of Beyond Good and Evil and Nietzsche's views at that time. The claims he makes about truth and logic seem problematic to me: "Granted, we will truth: why not untruth ...
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What is the current state of the Correspondence Theory of Truth?

Is the Correspondent Theory of Truth currently the most important way of thinking about the nature of truth? What alternatives are important? Is there a version of the Correspondent Theory of Truth ...
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Relation between an argument and false premise on Knowledge

If I argue something from a premise such as "It's raining where I wrote this question" which is contingent false, then is it true that I could argue or deduct anything? For example, from the premise ...
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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 ...
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What is the relationship between meaning and truth? [closed]

For all I can see, a sentence (or a string of symbols, etc) can only have a truth value if it is meaningful. What does this entail vis-à-vis the relationship between meaning and truth? Are a ...
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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 ...
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Absolute Truth - Is there existence?

I restate the question in a simpler and more specific way; is there a proof or has a philosopher proved, that things can be absolute and observed by each in the same way? Are there like conserved ...
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Can correspondence and coherence views of truth be compatible?

If in the course of interacting with an external world, a person is creating a set of coherent knowledge about this world, then there should be a mapping between their beliefs and the external facts. ...
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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. ...
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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 ...
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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 ...
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Do questions about the ultimate truth make sense? Are we capable of understanding the system in which we live? (Looking for directions/references)

I am recently reading a lot about topics like free will or consciousness. It seems that many philosophers are trying to argue about these concepts in an ultimate and final way, that means they are ...
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Fundamental Truths in Philosophy [duplicate]

Many years ago I took a philosophy class that covered Descartes. The teacher logically explained to us the "I think Therefore I am" over the course of a week. He also said that it was one of the ...
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Truth and actuality

J. Krishnamurti and Prof. David Bohm discuss the topic of truth and actuality (reality). They touch on reality however in my opinion and understanding don't clarify or define truth. For example, ...
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Truth Tables and Venn Diagrams: Prove Contingent statement are consistent [closed]

I am trying to prove how consistent statements can be contigent. The problem i am having how to use a truth table to prove this.
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Do malformed propositions have True/False values?

Many people are familiar with the malformed questions that, no matter which way they are answered, reflect poorly on the person to whom they were asked. For example: Have you stopped beating your ...
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Is truth inherent in honesty? [closed]

Is truth inherent in honesty? In other words, may we establish a correlation, an isomorphism if you will, a functor, perhaps a forgetful one? Between truth and honesty? Pardon me, this question is ...
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If all the premises of an argument are true, is the argument logically valid?

Where an argument is said to be logically valid "if and only if it is not possible for the premises to e true and the conclusion false". I know that the argument is indeed logically valid if all the ...