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Kevin Walker

http://canyon23.net/math/

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Top Questions
29 votes

triangulated vs. dg/A-infinity

homological-algebra a-infinity-algebras homotopy-theory asked Oct 17 '09 at 0:21
mathoverflow.net

21 votes

Brauer Groups and K-Theory

at.algebraic-topology kt.k-theory-homology asked Feb 2 '12 at 16:45
mathoverflow.net

17 votes

Group cochains invariant under the action of the symmetric group

reference-request at.algebraic-topology gr.group-theory finite-groups group-cohomology asked Jan 8 '14 at 20:02
mathoverflow.net

16 votes

Explicit constructions of K(G,2)?

gt.geometric-topology at.algebraic-topology asked Apr 13 '11 at 14:07
mathoverflow.net

15 votes

References for homotopy colimit

reference-request ct.category-theory gn.general-topology homotopy-theory limits-and-colimits asked Oct 13 '09 at 21:16
mathoverflow.net

14 votes

Can you name these orthogonal polynomials?

orthogonal-polynomials rt.representation-theory asked Mar 5 '12 at 23:56
mathoverflow.net

14 votes

Time reversal symmetry and T^2 = -1

quantum-field-theory symmetry fermions spin-statistics time-reversal asked Jan 20 '12 at 18:00
physics.stackexchange.com

14 votes

Non-split Aut(G) $\to$ Out(G)?

gr.group-theory finite-groups automorphism-groups outer-automorphisms asked Feb 20 '18 at 15:08
mathoverflow.net

13 votes

Categorification of coends and ends

reference-request ct.category-theory higher-category-theory asked Sep 4 '12 at 15:43
mathoverflow.net

13 votes

Langlands duality and multiplying cocharacters

rt.representation-theory lie-groups geometric-langlands asked Nov 20 '14 at 14:15
mathoverflow.net

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Top Answers
35
Where is number theory used in the rest of mathematics?
mathoverflow.net

34
Thurston's “tinker toy” problem
mathoverflow.net

31
Cubical vs. simplicial singular homology
mathoverflow.net

27
Why hasn't anyone proved that the two standard approaches to quantizing Chern-Simons theory are equivalent?
mathoverflow.net

23
Are higher categories useful?
mathoverflow.net

22
Operations via Morse Theory
mathoverflow.net

21
Geometric model for classifying spaces of alternating groups
mathoverflow.net

21
What's the current state of the classification of not-fully-extended TQFTs?
mathoverflow.net

19
How to Tackle the Smooth Poincare Conjecture
mathoverflow.net

17
Are there any differences between “oval” and “ellipse”?
english.stackexchange.com

17
Relation between fully-extended TQFT and a “topless” TQFT
mathoverflow.net

16
How are the Walker-Wang TQFT and the Crane-Yetter TQFT related?
mathoverflow.net

14
How to calculate the Witten-Reshetikhin-Turaev invariants from a triangulation?
mathoverflow.net

14
A Pachner complex for triangulated manifolds
mathoverflow.net

14
heegard diagram
mathoverflow.net

13
Do all 3D TQFTs come from Reshetikhin-Turaev?
mathoverflow.net

13
A soft introduction to physics for mathematicians who don't know the first thing about physics
mathoverflow.net

13
Picturing a Certain Torus and Klein Bottle
mathoverflow.net

12
Does there exist a discrete gauge theory as a TQFT detecting the figure-8 knot?
mathoverflow.net

12
Maximal exotic $\mathbb{R}^4$
mathoverflow.net

12
4D TQFT from a modular tensor category
mathoverflow.net

12
3-manifolds bounded by a non-compact Riemann surface of genus 0
mathoverflow.net

11
Why can't we take three loops?
mathoverflow.net

11
How many mathematicians are there?
mathoverflow.net

11
“Dirty” proof that Eilenberg-MacLane spaces represent cohomology?
mathoverflow.net

11
Is the endomorphism algebra of a dualizable bimodule necessarily finite dimensional?
mathoverflow.net

11
Geometric interpretation of the Pontryagin square
mathoverflow.net

10
What's the right way to think about “anomalies” in 3d TQFTs?
mathoverflow.net

10
In knot theory: Benefits of working in $S^3$ instead of $\mathbb{R}^3$?
mathoverflow.net

10
Anomalies in the definition of Turaev's TQFT
mathoverflow.net

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