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Questions tagged [peirce]

One of the greatest American philosophers, Peirce was James's and Dewey's teacher. However, his pragmatism—which he preferred to call "pragmaticism"—differed radically from James's and Dewey's positivist, nominalistic pragmatism. Pragmaticism uploads Scholastic realism.

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What would be an intuitive understanding of Peirce's law?

Wikipedia describes Peirce's law as In propositional calculus, Peirce's law says that ((P→Q)→P)→P. Written out, this means that P must be true if there is a proposition Q such that the truth of P ...
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In which writings does Charles Sanders Peirce generalize the idea of freedom so that it applies to all creatures?

Charles Hartshorne claimed that Peirce was pretty close to the first philosopher in the world who generalized the idea of freedom so that it applied to all the creatures.... In which writings ...
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Derive |- [(P>Q)>P]>P using only primitive rules

I've been having issues trying to derive |- [(P>Q)>P]>P in natural deduction using only primitive rules. Wondering if anyone would have a solution to it. Thanks
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What did C. S. Peirce mean by this remark about the phrase “necessary and sufficient condition”?

As I was reading through The Collected Papers of Charles Sanders Peirce, I came across the following sentence: I doubt not that readers have been fretting over the ridiculous-seeming phrase “...
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What are the similarities/differences between how Kant thinks 'noumenon' limits understanding compared to C.S. Peirce?

Kant stated in Critique of Pure Reason, pg. 273: What our understanding acquires through this concept of a noumenon, is a negative extension; that is to say, understanding is not limited through ...
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Are “if smoke then fire” arguments deductive or inductive?

I'm new to philosophy and have a question regarding deductive vs. inductive reasoning: I'm told that "John ate a strange plant in the forest and got sick. Clearly, the plant made John sick." I ...
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How far can/should one press philosophical doubt?

Should we keep on questioning until nothing is left to question or is there a point on which we need to stand (which we often tend to do)? Descartes used 'I think' as this fixed point where the ...
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Is Peirce's pragmatic maxim self-evident?

Peirce's pragmatic maxim seems to have an appeal, at least as a "tiebreaker": Consider what effects, that might conceivably have practical bearings, we conceive the object of our conception to have....
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What is the relation between 'knowledge-that' and 'knowledge-how'?

Quick bit of definitions for the words: Knowledge-that is knowledge that answers a question about a thing. It is informative of a thing's nature or kind. Knowledge-how is knowledge that is expressed ...
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Origin of Charles Sander Peirce's model of triadic signs diagram?

Does anyone know the origin of this diagram based on Charles Sander Peirce's model of triadic signs? http://faculty.georgetown.edu/irvinem/theory/peirce-semiosis.gif Is it by Peirce and if so from ...
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Peirce's law, law of the excluded middle, and intuitionism.

I have no training in formal logic and have tried to understand how Peirce's law is equivalent to the law of the excluded middle to no avail. I hope someone can explain this to me. Also, in passing, ...
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Is there any reason for the heavy focus on binary relations in formal logic?

As a fan of C. S. Peirce, I'm surprised that, at least triadic relations, aren't investigated as much as binary relations are. What I mean is that with binary relations, they have already been ...
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Are concepts necessarily false even if useful?

I was listening to Neil deGrasse Tyson on Star Talk the other day, and he was answering a question about orbits. But he added that it's not entirely true that, for instance, the earth orbits the sun, ...
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What were Peirce's trinary conception of logic?

Peirces conception of the trinary structure of thought is mentioned in passing in the SEP on Hegels Logic Hegel's later treatment of the syllogism found in Book 3, in which he follows Aristotle's ...
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What exactly is Peirce trying to argue here?

This paragraph from SEP under the sub-heading Peirce on Reality and Truth: We can then think of the real only as the cause of the (singular) sensations which, in turn, provide our sole ...
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What are the main differences between Peirce, James, & Dewey?

Peirce, James, & Dewey are generally regarded as the three originators of American pragmatism. Personally, I have noticed each of them for different reasons. James is interesting because of his ...