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Henry Towsner's user avatar
Henry Towsner's user avatar
Henry Towsner's user avatar
Henry Towsner
  • Member for 14 years, 3 months
  • Last seen more than a week ago
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About
Assistant Professor at UPenn.
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Top posts
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answer
76
How should a "working mathematician" think about sets? (ZFC, category theory, urelements)
Nov 28, 2016
answer
38
How undecidable is the spectral gap?
Dec 12, 2015
answer
33
Is there a computable ordinal encoding the proof strength of ZF? Is it knowable?
Apr 23, 2014
answer
22
Why do stacked quantifiers in PA correspond to ordinals up to $\epsilon_0$?
Aug 11, 2013
question
16
Dual of the Ultraproduct of a Banach Space
Jan 25, 2011
answer
16
What is the proof-theoretic ordinal of PA + Con(PA), PA + Con(PA + Con(PA)) etc., and why?
Jan 21, 2014
answer
15
Consistency of Analysis (second order arithmetic)
Mar 8, 2014
answer
15
Birkhoff ergodic theorem and the measure of the bad points
Aug 25, 2013
answer
13
Why is there a need for ordinal analysis?
Dec 4, 2015
answer
13
Natural examples of Reverse Mathematics outside classical analysis?
Nov 1, 2014
Top network posts
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155
Should I admit that I can't find a solution to a math problem?
112
Is it fair to give zeros to students who missed early assignments because they added the class late?
96
Am I being a "mean" instructor, denying an extension on a take home exam?
92
Asked again to review a paper, when the authors don't wish to modify it
89
Why is learning mathematics compulsory?