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MathOverflow : Recent Questions and Answers (Page 18)

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Invariant theory in universal algebra

Let $mathcal{L}$ be a finite first-order language with no relation symbols, and $mathcal{K}:=mathcal{V}(Theta)$ a variety in this language definited by a set of identities $Theta$. My questions...

Asked on 11/09/2021

0 answer

Motivic cohomology and resolution of singularities

Suppose $X$ is a singular variety and we somehow know its motivic cohomology groups. Can the knowledge of motivic cohomology help in understanding the singularities of $X$ and...

Asked on 11/09/2021 by user161444

0 answer

Do roots of polynomial with coefficients in a CM field lie in a CM field?

This is something that I have been thinking about for a while now, not sure if it is standard (or even true at all) or not: Let $K/ mathbb...

Asked on 11/09/2021

0 answer

Exit time for Brownian motion with stochastic barriers

I am interested in the expected exit time of a one-dimensional Brownian particle from a stochastically evolving interval as follows. Context: If $L_t$ and $R_t$ denote the distance...

Asked on 11/09/2021 by as1

0 answer

Concavity of distance to the boundary of Riemannian manifold

Let $(M^n,g)$ be a smooth Riemannian manifold with non-empty boundary $partial M$. Assume (for simplicity) that $M$ is compact. Let $M$ be locally geodesically convex, i.e....

Asked on 11/09/2021 by makt

0 answer

About functions primitive recursively definable using a $ Sigma _ 1 $ oracle

In a discussion with one of my friends about degrees of computability, I was informed about something that was somehow new to me. As I'm not that much familiar with...

Asked on 11/09/2021 by Mohsen Shahriari

0 answer

Infinite sum in power series ring

Let $R$ be a commutative ring with $1$, $R[[x]]$ be the power series ring over $R$ and $A$ be an (prime) ideal of $R[[x]]$...

Asked on 11/09/2021

0 answer

Euler characteristic with compact support of spaces of Euclidean lattices

Has the Euler characteristic with compact support of $mathrm{SL}_n(mathbb R)/mathrm{SL}_n(mathbb Z)$ been computed ? References? Thanks....

Asked on 11/09/2021 by sadok kallel

1 answer

Oldest abstract algebra book with exercises?

Per the title, what are some of the oldest abstract algebra books out there with (unsolved) exercises? Maybe there are some hidden gems from before the 20th century out there....

Asked on 11/09/2021 by Squid with Black Bean Sauce

3 answer

Question about Jacobian subalgebra

Assume that the algebraically independent polynomials $f, ginmathbb{C}[x, y]$ are such that the Jacobian matrix $text{Jac}_{x, y}^{f, g}inmathbb{C}setminus{0}$. Is it true that $mathbb{C}[x, y] = mathbb{C}[f, g]+gcdotmathbb{C}[x,...

Asked on 11/09/2021

1 answer

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