Joel David Hamkins

Member for 15 years, 1 month
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jdh.hamkins.org
University of Notre Dame

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computability-theory

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Answers

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393

What are some reasonable-sounding statements that are independent of ZFC?

Nov 23, 2009

263

What are the most misleading alternate definitions in taught mathematics?

Dec 6, 2009

241

Is the analysis as taught in universities in fact the analysis of definable numbers?

Oct 29, 2010

174

Solutions to the Continuum Hypothesis

May 19, 2010

173

Most 'unintuitive' application of the Axiom of Choice?

Jul 15, 2011

Questions

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135

What are the most attractive Turing undecidable problems in mathematics?

Jan 12, 2010

94

Is there a dense subset of the real plane with all pairwise distances rational?

Mar 23, 2010

92

Is every sigma-algebra the Borel algebra of a topology?

Feb 7, 2012

88

Is the sphere the only surface with circular projections? Or: Can we deduce a spherical Earth by observing that its shadows on the Moon are circular?

Sep 17, 2010

82

How do the compact Hausdorff topologies sit in the lattice of all topologies on a set?

Feb 19, 2010

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Is there a natural topology for sets of topological spaces?

-2

A rigid type of structure that can be put on every set?

+20

How do the compact Hausdorff topologies sit in the lattice of all topologies on a set?

+10

Authorship of Grothendieck universes

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