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Allen Hatcher's user avatar
Allen Hatcher's user avatar
Allen Hatcher
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answer
86
Why do finite homotopy groups imply finite homology groups?
Dec 20, 2009
answer
82
Learning Topology
Dec 11, 2009
answer
79
Maps which induce the same homomorphism on homotopy and homology groups are homotopic
Feb 5, 2015
answer
77
Definition of "simplicial complex"
Nov 20, 2009
answer
75
Periods and commas in mathematical writing
Nov 25, 2009
answer
73
Homotopy groups of Lie groups
Dec 15, 2009
answer
60
Intuition behind Thom class
Sep 22, 2012
question
53
On Euler's polynomial $x^2+x+41$
Jun 10, 2019
answer
51
Triangulating surfaces
Dec 13, 2013
answer
48
Spectral sequences: opening the black box slowly with an example
Nov 6, 2010
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23
Show that $\Sigma(\mathbb{R} P^3)$ is not homotopy equivalent to $\Sigma(\mathbb{R} P^2 \vee S^3)$
19
Does there exist a space $W$ s.t. $X\to W,\ Y\to W$ are covering spaces when $Z\to X,\ Z\to Y$ are covering spaces?
14
Homotopy lifting property of $\mathbb{R} \to S^1$ in Hatcher
13
Who proved that existence of a retraction $r:X\times\mathbb{I}\rightarrow X\times\left\{ 0\right\} \cup A\times\mathbb{I}$ was sufficient for HEP?
7
triviality of vector bundles with the reduced homology of base space entirely torsion