151

Questions
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What is the precise relationship between groupoid language and noncommutative algebra language?

jul 13 10 at 5:12 Theo Johnson-Freyd 22.3k●2●28●111

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Can epi/mono for natural transformations be checked pointwise?

mar 11 11 at 13:30 Ralph 12.5k●10●36

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What abstract nonsense is necessary to say the word “submersion”?

nov 12 10 at 11:36 Wouter Stekelenburg 504●6

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The tangent bundle to an infinite-dimensional manifold

jun 29 11 at 17:49 Fly by Night 421●2●9

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If “tensor” has an adjoint, is it automatically an “internal Hom”?

may 25 10 at 21:46 Buschi Sergio 1,799●1●4●8

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Is the space of volume-preserving maps path-connected?

aug 25 11 at 0:49 Ryan Budney 21.7k●1●40●101

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Is the pure braid group on three strands generated as a normal subgroup of the braid group by the six-crossing braid?

jan 22 11 at 19:35 Rick Kubelka 19●1●2

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How difficult is Morse theory on stacks?

may 8 10 at 18:36 André Henriques 14.9k●2●30●83

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Why should I prefer bundles to (surjective) submersions?

jan 24 11 at 3:29 John Klein 7,216●19●28

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Are there results from gauge theory known or conjectured to distinguish smooth from PL manifolds?

mar 18 at 5:21 unknown (google) 5,540●6●30

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