some guy on the street

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23

54

votes

1

answer

3k

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Nontrivial finite group with trivial group homologies?

gr.group-theory group-cohomology open-problem

feb 10 at 22:44 Dennis Sullivan 121●1●2

7

14

votes

0

answers

271

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Lipschitz constant of a homotopy

dg.differential-geometry mg.metric-geometry homotopy-theory at.algebraic-topology

jun 11 at 7:57 Anton Petrunin 16.5k●41●110

7

12

votes

1

answer

529

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Homology in the $A_\infty$ World

homological-algebra a-infinity-algebras rt.representation-theory model-categories

apr 7 at 17:15 Tim Perutz 8,655●1●16●42

4

10

votes

2

answers

279

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What is the Q-construction, metaphysically?

algebraic-k-theory ct.category-theory higher-category-theory

apr 25 at 23:40 Steven Landsburg 8,634●1●27●47

6

9

votes

0

answers

255

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Hilton-Eckmann dual of the Steenrod Algebra

at.algebraic-topology homotopy-theory

may 16 12 at 14:26 John Klein 7,216●19●28