Geva Yashfe

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reference-request

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Is there a closed manifold whose universal cover is $\mathbb{R}^n\setminus\{x_1, \dots, x_k\}$ for some $k > 1$?

Mar 30, 2022

13

Determining whether a lattice is the face lattice of a polytope - NP hard or undecidable?

Oct 17, 2022

8

On the Galois group of the compositions of polynomials

Jun 5, 2021

6

Does the union of the subcomplexes of $X$ that contain a given subcomplex and whose inclusion in $X$ is trivial on $\pi_1$, have trivial $\pi_1$?

Oct 15, 2020

5

How can we make precise the notion that a finite-dimensional vector space is not canonically isomorphic to its dual via category theory?

Mar 9, 2021

Questions

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6

If cohomology theory corresponds to intersection theory, valuation theory corresponds to -?

Oct 23, 2020

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examples

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manifolds

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covering-spaces

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reference-request

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3

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convex-polytopes

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posts

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+10

On the Galois group of the compositions of polynomials

+145

Determining whether a lattice is the face lattice of a polytope - NP hard or undecidable?

+10

Is there a closed manifold whose universal cover is $\mathbb{R}^n\setminus\{x_1, \dots, x_k\}$ for some $k > 1$?

+10

A notion of 2-dimensional tree

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