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John C

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283

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Examples of common false beliefs in mathematics. [closed]

big-list mathematics-education tag-removed

apr 16 at 19:41 Benjamin Steinberg 10.8k●1●14●49

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27

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Does $2^X=2^Y\Rightarrow |X|=|Y|$ imply the axiom of choice?

set-theory lo.logic axiom-of-choice

aug 25 at 0:13 Asaf Karagila 7,448●1●15●44

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9

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2

answers

752

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Singular chains in Spivak’s Calculus on Manifolds

dg.differential-geometry gt.geometric-topology

jan 15 12 at 16:21 Liviu Nicolaescu 11.5k●1●21●33

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9

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4

answers

960

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Is an identity that is true for matrix Lie groups true for all Lie groups?

lie-groups

nov 25 11 at 18:32 Johannes Ebert 11.6k●33●56

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8

votes

1

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Points in sites (etale, fppf, … )

ag.algebraic-geometry etale-cohomology reference-request sites

jan 6 at 22:14 David Corwin 6,730●23●57

3

6

votes

2

answers

352

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Canonical topology for infinity topoi revisited.

topos-theory infinity-topos-theory higher-category-theory ct.category-theory

may 7 12 at 1:20 David Carchedi 7,952●10●28

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2

votes

1

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242

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Prove that algebraic structure is not semiring?

universal-algebra

nov 29 11 at 0:19 Jacques Carette 6,797●1●14●36