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MathOverflow : Recent Questions and Answers (Page 21)

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Examples of "non equivalent" algebras that are derived equivalent?

One can define different equivalence relations between algebras depending on what one want to study, but also these definitions may have their own life and not result as one expected...

Asked on 11/03/2021 by Marco Farinati

0 answer

Equivalence of families indexes of Fredholm operators

Let $F=F(H,H)$ be the space of bounded Fredholm operators in a Hilbert space $H$ with topology inherited from the norm operator topology, and let $X$ be a...

Asked on 11/03/2021 by Rodrigo Dias

1 answer

An example of a special $1$-dimensional non-Noetherian valuation domain

I am looking for a $1$-dimensional non-Noetherian valuation domain $R$ such that there exists a sequence ${a_i}_{i=1}^infty$ of elements of $R$ such that $langle a_1rangle...

Asked on 11/03/2021 by S. T. Stanly

1 answer

What are some interesting applications of the Archimedean Property?

So a wile back I managed to prove the The Remainder Theorem starting from the Archimidean property and since then I've thought what could be other results which can be...

Asked on 11/03/2021 by fisura filozofica

0 answer

Origins of the ``baby Freiman'' theorem

It is a basic folklore fact from the area of additive combinatorics that a subset $A$ of an abelian group satisfies $|2A|<frac32,|A|$ if and only if $A$...

Asked on 11/03/2021 by Seva

0 answer

Is there a (discrete) monoid M injecting into its group completion G for which BM is not homotopy equivalent to BG?

For a (discrete) monoid $M$, the classifying space $BM$ is thegeometric realization of the nerve of the one object category whosehom-set is $M$. (This definition gives the usual...

Asked on 11/03/2021 by Omar Antolín-Camarena

0 answer

Unrestricting The Parameters of a Functional Equation

Good evening. I am looking into methods of generalization of Bernoulli polynomials. First, define $$Phi_{N,k}(x)=frac{1}{N}sum_{j=0}^{N-1}omega_N^{-jk}expleft(omega_N^jxright)$$ where $omega_N$ is the first $N$-th root of unity. The multiplicative...

Asked on 11/03/2021

0 answer

Pseudoreflection groups in affine varieties

Suppose $mathsf{k}$ is an algebraically closed field of zero characteristic. Chevalley-Shephard-Todd (C-S-T) Theorem in one of its equivalent versions is the following result: (C-S-T): Let $G$ be a...

Asked on 11/03/2021

0 answer

Image of function contains identity elements

Let $U$ be the set of all nonempty subsets of $[0,1]$ that are a union of finitely many closed intervals (where an "interval" that is a single...

Asked on 11/03/2021 by pi66

0 answer

Integrate Radon-Nikodým derivatives against Lebesgue measure

I am struggling for quite some time, because of a problem involving Radon-Nikodým derivatives. I will try to describe the main features and perhaps somebody has an idea how to...

Asked on 11/03/2021

1 answer

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