15

Questions
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Interpretation of the Second Incompleteness Theorem

aug 17 at 13:37 Stefan Geschke 10.5k●1●14●37

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10
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2
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940
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Realizing groups as automorphism groups of graphs.

sep 1 10 at 17:46 François G. Dorais♦ 22.4k●2●48●113

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Independent families of subsets of $\mathbb N$ of size continuum

apr 4 12 at 10:24 KP Hart 2,281●3●11

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Axiom of Choice: Ultrafilter vs. Vitali set

mar 19 at 18:13 Paul Larson 196●2●3

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9
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Is non-connectedness of graphs first order axiomatizable?

aug 29 10 at 13:21 Joel David Hamkins 74.9k●7●187●343

 
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3
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757
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What is this operation on graphs called?

sep 29 10 at 16:55 Stefan Geschke 10.5k●1●14●37

 
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1
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394
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Classes of finite graphs closed under substitution

dec 3 11 at 19:22 MathOverflow♦ 1●2●3

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4
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379
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Groups as automorphism groups of small graphs and the number of rigid graphs of a given size

sep 1 10 at 17:38 Pete L. Clark 39.5k●3●102●225

 
7
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2
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375
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Simple proof that these graphs are perfect

jul 28 10 at 20:12 François G. Dorais♦ 22.4k●2●48●113

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6
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1
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325
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Existence of non-principal ultrafilters on sets

sep 27 11 at 11:55 François G. Dorais♦ 22.4k●2●48●113

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