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MathOverflow : Recent Questions and Answers (Page 13)

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Example of an intersection complex not concentrated in a single degree

I'm having trouble finding references for in-depth examples of perverse sheaves, so answers in the form of such a reference would be most helpful. I want to construct an example...

Asked on 11/29/2021

1 answer

Is every proper regular relative algebraic space curve over a Dedekind domain projective?

This question is in some sense a follow up to a related question Is a normal proper relative curve over a DVR projective? Let $R$ be a Dedekind domain,...

Asked on 11/26/2021 by Lisa S.

1 answer

Examples of residually-finite groups

One of the main reasons I only supervised one PhD student is that I find it hard to find an appropriate topic for a PhD project. A good approach, in...

Asked on 11/26/2021 by Yiftach Barnea

7 answer

Reference: Packing under translation is in NP

I am looking for a reference for a result that I am aware of.Let me describe the result. Given a polygon $C$ and polygons $p_1,ldots,p_n$, it can...

Asked on 11/26/2021 by Till

1 answer

Representing a continuous time-inhomogeneous Markov chain by a stochastic integral

I am interested in the following mean-field model introduced in the reference below: There are $N$ particles. At each instant of time, a particle's state is a particular value...

Asked on 11/26/2021

0 answer

Convergence of empirical measure to Mc-Kean Vlasov equation for mean-field model with jumps

I am interested in the following mean-field model introduced in the reference below: There are $N$ particles. At each instant of time, a particle's state is a particular value...

Asked on 11/26/2021 by SID A

0 answer

Values of a pair of determinants

Let $mathbf{x} = (x_0, x_1, x_2), mathbf{y} = (y_0, y_1, y_2)$ be vectors over a field $mathbb{F}$ of characteristic zero. Define the function $displaystyle S(mathbf{x}, mathbf{y}) =...

Asked on 11/26/2021

1 answer

What subsystem of third order arithmetic proves the real numbers are Dedekind complete?

Reverse mathematics is mainly about subsystems of second-order arithmetic, but in recent years it’s expanded to cover subsystems of third-order arithmetic as well. Now the fact that the real...

Asked on 11/26/2021

1 answer

Algebras Morita equivalent with the Weyl Algebra and its smash products with a finite group

My question os motivated, naturally, by the problem of classifying symplectic reflection algebras up to Morita equivalence (a classical reference for rational Cherednik algebras is Y. Berest, P. Etingof, V....

Asked on 11/24/2021

1 answer

Error rate implying regularity

My question is a bit general/vague. It is well known that the regularity of certain functions can be measured through the rate of decay of certain error quantity based on...

Asked on 11/24/2021 by user69642

0 answer

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