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Answers
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2
Why is Set, and not Rel, so ubiquitous in mathematics?
0
Groupoid actions on spaces
2
Magic trick based on deep mathematics
4
Compact open topology
2
Homotopy equivalences preserving structure
0
Group extensions with a non-commutative kernel
15
Modern Mathematical Achievements Accessible to Undergraduates
9
Generalized Categories for “Higher Homotopy Groupoids”
7
Infinity-categories vs Kan complexes
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Are k-spaces named for Kelley?
1
Stratifications and Cohomology Computations
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Connected groupoids and action groupoids
5
Giving $Top(X,Y)$ an appropriate topology
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The definition of a CW complex and related notions
12
Compelling evidence that two basepoints are better than one
2
Is there a “mathematical” definition of “simplify”?
1
Anick resolution
1
Finitely cocomplete categories of compact Hausdorff spaces
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Examples where it’s useful to know that a mathematical object belongs to some family of objects
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Natural transformations as categorical homotopies
5
First mention of the fundamental bigroupoid of a space?
2
Has any attempt been made to classify finite groupoids?
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Understanding Adjointness of Sheaves in Algebraic Geometry
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What space classifies bundles of K(pi,1)'s?
7
A possible generalization of the homotopy groups.
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Second homotopy of a torus complement in the 4-sphere
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Semidirect product of groupoids
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How can I understand the “groupoid” quotient of a group action as some sort of “product”?
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Free product of categories
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What are the symmetries of a principal homogeneous bundle?
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