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John Klein
  • Member for 12 years
  • Last seen this week
  • Metro Detroit. Brooklyn expatriate.
33 votes
Accepted

Can anyone explain to me what is an assembly map?

26 votes
Accepted

Groupoid actions on spaces

19 votes

A map inducing isomorphisms on homology but not on homotopy

19 votes

Fibrations and Cofibrations of spectra are "the same"

18 votes

Lambda-operations on stable homotopy groups of spheres

18 votes

What is the intuition behind the Freudenthal suspension theorem?

17 votes
Accepted

Finite-dimensionality for de Rham cohomology

17 votes
Accepted

The classifying space of a gauge group

17 votes
Accepted

Realizing cohomology classes by submanifolds

17 votes
Accepted

Immersions of surfaces in $\mathbb{R}^3$

16 votes

Is an A-infinity thing the same the same as strict thing viewed through a homotopy equivalence?

16 votes

What does actually being a CW-complex provide in algebraic topology?

16 votes

Choice of base point in a Waldhausen category

15 votes

Parallelizability of the Milnor's exotic spheres in dimension 7

14 votes

Computational complexity of computing homotopy groups of spheres

14 votes

How to prove the connected sum of two closed aspherical n-manfolds (n >2) is not asperical?

14 votes
Accepted

Characteristic classes for block bundles

14 votes

Unstable manifolds of a Morse function give a CW complex

13 votes
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Reverse map of a homology equivalence.

13 votes

Is any CW complex with only finitely many nonzero homology groups homotopic to a finite dimensional CW complex?

13 votes

do spectra have diagonal maps?

12 votes
Accepted

Definition of Pontrjagin Classes

12 votes

The space of framed functions

12 votes

Why should I prefer bundles to (surjective) submersions?

12 votes
Accepted

Is the J homomorphism compatible with the EHP sequence?

12 votes
Accepted

Uses of Volodin's construction of algebraic K-theory

11 votes

Homotopy classification of selfmaps of product of spheres?

11 votes
Accepted

Linking topological spheres

11 votes

Does the Borel functor take equivariant fibrations to fibrations?

11 votes

topological type of smooth manifolds with prescribed homotopy type and pontryagin class

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