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11 votes

Examples of hard but accessible problems in mathematics

soft-question math-history big-list asked Jul 13, 2020 at 15:07
math.stackexchange.com

11 votes

What is a good category of tame topological spaces?

general-topology geometry algebraic-topology foundations asked Oct 12, 2020 at 22:19
math.stackexchange.com

10 votes

Top Homology of Manifolds via Formal Homology Theory

reference-request algebraic-topology manifolds homology-cohomology asked Jan 19, 2020 at 19:43
math.stackexchange.com

9 votes

Neighborhood deformation retracts vs cofibrations

algebraic-topology homotopy-theory model-categories asked Feb 15, 2020 at 17:52
math.stackexchange.com

7 votes

Does every topological manifold admit a good or sufficient cover?

general-topology algebraic-topology manifolds asked Feb 19, 2020 at 20:41
math.stackexchange.com

7 votes

How do the various homotopy 2-categories compare?

homotopy-theory simplicial-stuff infinity-categories 2-categories simplicial-categories asked Jan 7, 2022 at 15:24
mathoverflow.net

7 votes

Constructing Algebraic Closures in ETCS

category-theory foundations topos-theory alternative-set-theories asked Oct 30, 2022 at 14:17
math.stackexchange.com

6 votes

Has Globular Homology been studied?

reference-request algebraic-topology homology-cohomology asked Sep 28, 2021 at 18:14
math.stackexchange.com

6 votes

Why is everything geometrical modeled on $\Bbb R$?

general-topology geometry real-numbers meta-math asked Dec 12, 2020 at 12:29
math.stackexchange.com

6 votes

Stalks of Manifolds

algebraic-geometry algebraic-topology manifolds asked May 3, 2020 at 20:49
math.stackexchange.com

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