83

Questions

votes newest views recent

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4

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Cotangent bundle of a differentiable stack

stacks dg.differential-geometry orbifolds higher-category-theory

may 17 10 at 11:57 Urs Schreiber 6,439●13●21

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9

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3

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3k

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A number encoding all primes

nt.number-theory prime-numbers prime-numbers analytic-number-theory

sep 3 11 at 23:13 Charles 4,139●8●26

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7

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2k

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Connections between ultrafilters in topology and logic

ultrafilters gn.general-topology lo.logic

jun 22 10 at 20:32 Charles Matthews 9,720●12●39

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6

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1k

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A canonical and categorical construction for geometric realization

ct.category-theory at.algebraic-topology simplicial-stuff

aug 27 10 at 8:55 Todd Trimble 22.3k●1●62●96

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5

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Advantages of Diffeological Spaces over General Sheaves

dg.differential-geometry ct.category-theory topos-theory

may 18 11 at 8:30 Paolo Giordano 11●1

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14

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3

answers

879

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What do whitehead towers have to do with physics?

at.algebraic-topology higher-category-theory string-theory big-picture

dec 13 at 17:08 Urs Schreiber 6,439●13●21

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12

votes

2

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866

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Are all manifolds affine?

dg.differential-geometry ct.category-theory ag.algebraic-geometry

feb 20 12 at 21:24 Todd Trimble 22.3k●1●62●96

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13

votes

2

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857

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Classification of Quasi-topoi

ct.category-theory ct.category-theory topos-theory

jun 10 11 at 12:25 Steve Lack 1,739●7●11

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8

votes

1

answer

852

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Paracompact Hausdorff but not compactly generated?

point-set-topology gn.general-topology

jul 17 11 at 22:10 Colin McQuillan 531●1●7

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11

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3

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820

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Are monads monadic?

ct.category-theory monads

apr 5 10 at 0:17 Tom Leinster 13.5k●1●40●82