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Spice the Bird
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34
Examples where it's useful to know that a mathematical object belongs to some family of objects
Sep 2, 2011
question
21
If $X$ is a simplicial complex, is there a characterization of the links of its vertices that is equivalent to the statement "$|X|$ is a manifold"?
Dec 13, 2012
question
17
What is the homotopy type of the space of the homeomorphisms of the n-ball whose restriction to the boundary is isotopic to the identity?
Nov 7, 2012
answer
14
Fundamental problems whose solution seems completely out of reach
Jul 2, 2012
question
13
Is the following invariant of rooted trees a complete invariant?
Sep 22, 2012
question
11
What is the precise relationship between "prodsimplicial sets" and rooted trees?
May 23, 2012
answer
11
Why study simplicial homotopy groups?
Nov 10, 2011
answer
9
The concept of duality
Aug 29, 2011
answer
8
When and where did the term "module" enter commutative algebra?
Oct 5, 2011
answer
7
Why is the classifying space of the natural numbers homotopy equivalent to the circle?
Apr 14, 2012