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We provide a counter-example to Proposition 3.2 of "A note on the Fundamental Group of a Triangular Algebra", by F.Xu.

Rings and Algebras · Mathematics 2009-04-07 J. C. Bustamante , D. Castonguay

The aim of this note is to point out some inaccuracies in our paper \cite{HD} and to fix them. Some new notions are introduced and properties of them are investigated.

General Mathematics · Mathematics 2014-04-30 Kostaq Hila , Jani Dine

We provide an alternative and self contained proof of the main result of Bennett, Carbery, Tao regarding the multilinear restriction estimate. The approach is inspired by the recent result of Guth about the Kakeya version of multilinear…

Classical Analysis and ODEs · Mathematics 2016-01-14 Ioan Bejenaru

Here we continue the work started by Steve Krone on the two-stage contact process. We give a simplified proof of the duality relation, and answer most of the open questions posed in that paper. We also fill in the details of an incomplete…

Probability · Mathematics 2014-01-14 Eric Foxall

We give a simple proof of a recently result concerning Hardy $q$-inequalities.

Classical Analysis and ODEs · Mathematics 2014-12-18 Peng Gao

The purpose of this note is to correct an error in a paper of M. Cowling, G. Fendler and J.J.F. Fournier, and to give a counterexample to a conjecture of J.-L. Rubio de Francia.

Classical Analysis and ODEs · Mathematics 2007-05-23 Michael Cowling , Terence Tao

This is a talk given at YKIS '95, primarily to non-string theorists. I review the evidence for string duality, the principle that any string theory at strong coupling looks like another string theory at weak coupling. A postscript…

High Energy Physics - Theory · Physics 2009-10-28 Joseph Polchinski

We give a short proof of a slightly weaker version of the multilinear Kakeya inequality proven by Bennett, Carbery, and Tao.

Analysis of PDEs · Mathematics 2019-02-20 Larry Guth

Complete proofs of Schur-Weyl duality in positive characteristic are scarce in the literature. The purpose of this survey is to write out the details of such a proof, deriving the result in positive characteristic from the classical result…

Representation Theory · Mathematics 2008-08-28 Stephen Doty

In this note we refine the alternativity in some bifurcation theorems of Rabinowitz type, and then improve a few of results in Lu (2022) [17].

Functional Analysis · Mathematics 2023-09-13 Guangcun Lu

We first present a determinant inequality related to partial traces for positive semidefinite block matrices. Our result extends a result of Lin [Czech. Math. J. 66 (2016)] and improves a result of Kuai [Linear Multilinear Algebra 66…

Functional Analysis · Mathematics 2022-01-20 Yongtao Li

In this short note,we correct a well-known counter example of the famous book of Dacorogna[2].

Functional Analysis · Mathematics 2018-11-29 Yan Tang , Shiqing Zhang

In this paper, we consider the fractional sum of the divisor functions. We can improve previous results considered by Bordell\'{e}s \cite{Bo} and Liu-Wu-Yang \cite{LWY}.

Number Theory · Mathematics 2023-01-18 Wei Zhang

In this note we re-examine the analysis of the paper "On the martingale property of stochastic exponentials" by B. Wong and C.C. Heyde, Journal of Applied Probability, 41(3):654-664, 2004. Some counterexamples are presented and alternative…

Probability · Mathematics 2019-07-10 Aleksandar Mijatović , Mikhail Urusov

Wu, Lou, Lai and Chang proposed a multi-exponentiation algorithm using binary complements and the non-adjacent form. The purpose of this paper is to show that neither the analysis of the algorithm given by its original proposers nor that by…

Combinatorics · Mathematics 2011-08-31 Clemens Heuberger , Helmut Prodinger

We study the duality between M-theory compactified on Calabi-Yau fourfolds and the heterotic string compactified on Calabi-Yau threefolds times a circle. Our analysis is based on a comparison of the low energy effective actions in three…

High Energy Physics - Theory · Physics 2007-05-23 Michael Haack , Jan Louis

In this note we provide important and significant observations in ring theory related to weakly tripotent rings. We provide counterexamples for the structure theorem for commutative weakly tripotent rings appeared in arXiv (2017) and Bull.…

Rings and Algebras · Mathematics 2026-02-09 Santosh Kumar Pandey

The purpose of the paper is to present an short proof of the Chuang's inequality.

Complex Variables · Mathematics 2017-12-05 Bikash Chakraborty

We point out that a concise proof of Theorem 2 in the article, 'On a quadratic estimate of Shafer' by L. Zhu contains a small mistake. Correcting this mistake and giving alternative proofs of Theorem 2 is the main aim of this note.

General Mathematics · Mathematics 2024-04-08 Yogesh J. Bagul , Ramkrishna M. Dhaigude

We extend the results of the general small-gain theorem proposed by Z.P Jiang. The significance of this extension is two fold. First, it allows one to use general vector norm to characterize the input-to-output property of two…

Systems and Control · Computer Science 2014-09-25 Yunsheng Li , Chi Jin