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Postdoc position on mathematics of constraint satisfaction in Paris

Manuel Bodirsky — Sat, 12 Jan 2013 14:55:28 GMT

... Postdoc position on mathematics of constraint satisfaction in Paris ... A postdoc position is available at LIX, Ecole Polytechnique, France, supported by

AAA85 third announcement

Erkko Lehtonen — Tue, 04 Dec 2012 08:19:09 GMT

The University of Luxembourg will host the 85th Workshop on General Algebra, 85. Arbeitstagung Allgemeine Algebra (AAA85) from January 31 to February 2, 2013.

Kevin's books

Japheth Wood — Tue, 27 Nov 2012 19:46:35 GMT

Dear Colleagues, Like many Universal Algebraists who spent time at Vanderbilt in the 1990s, I got to know Kevin Blount pretty well, and was surprised at his

Distributive lattices and coherence in homological algebra

Marco Grandis — Wed, 21 Nov 2012 08:53:30 GMT

The following paper has been published: M. Grandis, Distributive lattices and coherence in homological algebra, Asia Pac. Math. Newsl., 2 no. 4 (2012), 11-16.

Powers of Matrices

Jens Doll — Fri, 19 Oct 2012 07:56:09 GMT

Correction of my mistake for the formula: For 1 <= i,j <= n c(p,i,j) = a(i,j) for p=1 c(p,i,j) = Sum(1<=k<=n, c(p-1,i,k) * c(p-1,k,j)) for p>1 Now it looks

Re3: Powers of Matrices

Jens Doll — Tue, 16 Oct 2012 15:13:32 GMT

Given a (n,n) matrix A with coefficients a(i,j) one can define recursive equations for the coefficients c(m,i,j) of C = A ** m: For 1 <= i,j <= n c(p,i,j) =

Nobel Prize

Jonathan Farley — Tue, 16 Oct 2012 01:17:24 GMT

Al Roth's first paper was in lattice theory, if I recall correctly. (And Knuth proved that stable marriages form a distributive lattice.) This fact should be

Opening at SUNY New Paltz

David Hobby — Wed, 10 Oct 2012 02:11:10 GMT

Hi. We're doing open searches for two tenure-track positions at SUNY New Paltz. We have an ad up on MathJobs, as of yesterday. (Which says you're not to apply

Re: Powers of Matrices

Jens — Sat, 06 Oct 2012 14:53:56 GMT

Thanks for the answers. It is not solved yet, but more clear. I continue with my ring and some linear maps given by (n,n) matrices ... Jens

Re: Powers of Matrices

Keith A. Kearnes — Sun, 30 Sep 2012 17:56:28 GMT

Hi Jen and Steve- My guess is that Jens is looking for something like this: Let A = [a(i,j)] be an m\times m matrix. Let A[k] be the matrix for the k-th power

Re: Powers of Matrices

Steve Vickers — Sun, 30 Sep 2012 17:41:47 GMT

Dear Jens, First, I assume you mean A is (m,m). If it is not square you can't form its powers. Obviously for n = 2 you have a closed form using Sigma for

Powers of Matrices

Jens Doll — Sun, 30 Sep 2012 16:28:28 GMT

Hello all, when reasoning about computability, I came to the equation B = A ** n where A is an (m,n) matrix over a ring. I wonder if there is always a closed

AAA85 second announcement

Erkko Lehtonen — Tue, 18 Sep 2012 14:10:14 GMT

The University of Luxembourg will host the 85th Workshop on General Algebra, 85. Arbeitstagung Allgemeine Algebra (AAA85) from January 31 to February 2, 2013.

Re: Epimorphisms of finite modular lattices

Ralph Freese — Sun, 29 Jul 2012 02:43:08 GMT

PS. I should have mentioned that this ability to control the equations within an entire interval in the embedding's target began with Bjarni Jonsson, who

Re: Epimorphisms of finite modular lattices

Ralph Freese — Sun, 29 Jul 2012 02:22:14 GMT

First let me apologize for being so slow in responding---I've been traveling. The paper is "The variety of modular lattices is not generated by its finite