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MathOverflow : Recent Questions and Answers (Page 38)

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Max weighted matching where edge weight depends on the matching

Given a bipartite graph $G$, we seek a maximal weighted matching $E$. The particularity is below. Once an edge $e$ is chosen, the action of choosing ...

Asked on 12/25/2020

2 answer

Faltings' height theorem for isogenies over finite fields

For an Abelian scheme over a ring of integers in a number field, Faltings has a theorem that describes how the Faltings' height changes through an isogeny. There are multiple...

Asked on 12/21/2020 by Asvin

0 answer

Probability of positivity of rational solutions to a diophantine system?

Pick integers $a,b,c,d$ uniformly and randomly on conditions $a,b,c,d>0$, $ad+bc<2max(ac,bd)$, $ac<bd<(1+delta)^2ac$ at a fixed $delta>0$ (perhaps bigger than $1$) and $min(a,b,c,d)>max(m,n)$ where ...

Asked on 12/21/2020 by VS.

0 answer

On sup over boundaries of Sobolev functions

In Gilbarg-Trudinger's section on the maximum principle for weak solutions, the sup of a boundary of a Sobolev function defined as follows:Let $Omega$ be a bounded...

Asked on 12/20/2020 by Yongmin Park

0 answer

On weaker forms of the abc conjecture from the theory of Hölder and logarithmic means

In this post (the content of this post is now cross-posted from Mathematics Stack Exchange see below) we denote the radical of an integer $n>1$ as the product of...

Asked on 12/18/2020 by user142929

1 answer

If a morphism from a commutative absolutely flat ring has integral fibers, does it induce an embedding of spectra?

All rings are commutative and unital. Let $A$ be an absolutely flat ring and $A rightarrow B$ a ring monomorphism with integral fibers (i.e. for each $mathfrak{p}...

Asked on 12/18/2020 by Badam Baplan

0 answer

Set of points with a unique closest point in a compact set

Let $Ksubsetmathbb{R}^n$ be any compact set. Let $operatorname{Unp}(K)$ be the set of points in$$operatorname{Unp}(K)={xinmathbb{R}^nsetminus K:, exists ! yin K |x-y|=d(x,K)}.$$Here are...

Asked on 12/18/2020 by Piotr Hajlasz

2 answer

Complex $2$ manifold $M$ with a given real 2 dimensional submanifold which meets all complex limit cycles of foliations of $M$

Is there a $2$ dimensional holomorphic manifold $M$ with a closed $2$ dimensional real submanifold $A$ of $M$ such that for every...

Asked on 12/17/2020 by Ali Taghavi

0 answer

Rigorous multivariate differentiation of integral with moving boundaries (Leibniz integral rule)

The Leibniz integral rule, in its multivariate form, deals with differentiation of the following sort:$$ frac{partial}{partial t} int_{D(t)} F({bf x}, t) , d{bf x} ,...

Asked on 12/17/2020 by Amir Sagiv

1 answer

Closed form of the sum $sum_{rge2}frac{zeta(r)}{r^2}$

Note: This question has been brought here from MSE. I have been working on various sums involving the zeta function (which come up frequently in my research), and it...

Asked on 12/15/2020 by epic_math

0 answer

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