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PhD Program at IMT, Lucca

Ugo Montanari — Mon, 09 Nov 2009 09:33:09 GMT

PhD in Lucca, Italy Call for applications: Computer Science and Engineering Deadline December 4th 2009 Classes start in March 2010 Students can apply if they

Re: r=6mn + m + n

William Ftabob — Fri, 06 Nov 2009 07:03:25 GMT

I mean that r = 6mn + m + n is one of three solution sets as a test for primality. What I am looking for now is a quick test for r. ... From: Jens

Re: r=6mn + m + n

Jens — Thu, 05 Nov 2009 11:16:16 GMT

Do you mean, that you also found a periodic solution set? Do you also see structuring elements? JD

Re: A ditributive semilattice

William Ftabob — Wed, 04 Nov 2009 08:00:46 GMT

I introduced it after a loong study on primes, reason ois on the site. ________________________________ From: George Gratzer To:

Re: r=6mn + m + n

William Ftabob — Wed, 04 Nov 2009 07:59:18 GMT

Re: 6mn + m + n In explanation. If q is mod 30 element (1,7,13,19) potentail prime then if r = (q-1)/6 (so q is a 6x+1 potential prime) then if there exists

Re: A ditributive semilattice

JB Nation — Wed, 04 Nov 2009 00:46:46 GMT

Distributive semilattices are in Tamas Schmidt's booklet "Kongruenzrelationen Algebraischer Struckturen" (1968), p. 20. The idea is natural enough, but that's

Re: r=6mn + m + n

Jens — Tue, 03 Nov 2009 19:40:48 GMT

Once again: You have a relation (r,m,n) out of Z**3 with r=f(n,m):=6*m*n+m+n for which you could pose these questions: a) Does at least one solution exist? b)

Re: A ditributive semilattice

George Gratzer — Tue, 03 Nov 2009 15:30:18 GMT

And now a question for you: who and where introduced this concept? GG

6mn + m + n

fatbobforman — Tue, 03 Nov 2009 06:38:47 GMT

yes and it is also a sin trigonometric (di-harmonic). The question is, is there an easy test for r = 6mn + m +n?

Re: Diophantine Curves

fatbobforman — Tue, 03 Nov 2009 06:35:23 GMT

Re: A ditributive semilattice

gratzer — Tue, 03 Nov 2009 05:47:38 GMT

Did you check my book? GG

Re: Any fast-growing group-like objects?

Fred E.J. Linton — Tue, 03 Nov 2009 03:22:18 GMT

On Mon, 02 Nov 2009 02:09:11 PM EST, Vaughan Pratt ... Try M-sets, where M is the monoid presented by two generators, *one* of which is

A ditributive semilattice

buls@... — Mon, 02 Nov 2009 22:58:17 GMT

Apologies if this is triviality but I should like to knoww the proof of such result (Wikipedia): A join-semilattice is distributive if and only if the lattice

Any fast-growing group-like objects?

Vaughan Pratt — Mon, 02 Nov 2009 19:08:37 GMT

Grp is an example of a variety with an operation that is cancellable. However the number of groups of order n up to isomorphism, for n up to 93, is only

Diophantine Curves

Jens — Mon, 02 Nov 2009 11:05:23 GMT

It's symmetrical and can be seen as a bilinear function f(m,n)=6*m*n+m+n with a relation r=f(m,n) where for n,m>0 f(n+1,m)=f(m,n)+7 f(n,m)=f(m,n) ... Thanks,