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38 votes
Accepted

How undecidable is the spectral gap?

The connection to things like axiomitizations of math is then completely standard---any correct and consistent system of axioms cannot prove "$H^{\Lambda(L)}(n)$ is not gapped" for all $n$ for which this …
Henry Towsner's user avatar
6 votes

What are the advantages of the more abstract approaches to nonstandard analysis?

For most purposes, I think the premise is wrong: in many situations ultraproducts simply are the preferable approach, so I'll try to discuss some of the purposes which are exceptions. @cody has alrea …
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