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Philosophical aspects of logic and set theory; truth status of mathematical axioms; Philosophy of Mathematics; philosophical aspects of mathematics in general; relation of mathematics to philosophy; etc. Consider also posting at http://philosophy.stackexchange.com/, where philosophy-of-mathematics is one of the most popular tags.

7 votes

Interpretation of the Second Incompleteness Theorem

While it's not directly a philosophical benefit, the Second Incompleteness Theorem is quite useful for giving concrete unprovability results: if we want to prove that theory T does not prove theorem X …
Henry Towsner's user avatar
9 votes
Accepted

Reasoning Using Countable Subsets of Real Numbers

Suppose that during some argument (involving ℕ) one switches to real numbers and then back to discrete domain (before completing the argument). My question is, can one give examples where a switch …
Henry Towsner's user avatar
6 votes
Accepted

Is $PRA$ + $TI({\epsilon_0})$ mutually interpretable with some theory in the language of set...

Yes, the consistency of "ZFC with the axiom of infinity replaced by its negation" is provable in "PRA + TI($\epsilon_0$)". Technically one has to also show that "PRA + TI($\epsilon_0$)" can prove the …
Henry Towsner's user avatar
76 votes
Accepted

How should a "working mathematician" think about sets? (ZFC, category theory, urelements)

Set theory provides a foundation for mathematics in roughly the same way that Turing machines provide a foundation for computer science. A computer program written in Java or assembly language isn't …
Henry Towsner's user avatar