SECOND ANNOUNCEMENT ... Algebras, Lattices, Varieties - A Conference in Honor of Walter Taylor Boulder, Colorado August 15-18, 2004 We take great pleasure in...
Does the categorical notion of center due (I think) to Barr and Huq (see references below) coincide with the universal algebra notion of center as adumbrated...
(My apologies if you receive this message twice.) Dear Colleagues, This is a reminder that the deadline for submitting abstracts for the conference Algebras,...
Where do I find a proof that every subsemigroup of the additive group of all natural numbers is finitely generated? ...
Jiri Adamek
adamek@...
Oct 8, 2004 1:53 pm
230
Hi, I guess that some elementary number theory texts have this; I'm not sure. I published a paper in JSL around 1971 (vol. 36) showing that the first order...
Mckenzie, Ralph N
mckenzie@...
Oct 8, 2004 2:53 pm
231
This fact goes back to Frobenius (and Weierstrass). The problem is to recall who and where mentioned it in print. This is more difficult than just proving the...
Boris M Schein
bschein@...
Oct 8, 2004 3:33 pm
232
... You can also prove it using partial algebras. Starting from relative partial subsemigroups of N. The main construction is in a paper due to Mikenberg, I...
Obavam se Jirko, ze s nalezenim tohoto faktu budes mit problemy. Je to folklor, takze se da ocekavat v nejake zakladni ucebnici algebry. Ale moc bych neveril...
Vaclav Koubek
koubek@...
Oct 11, 2004 9:02 am
234
In their expository paper "On the subsemigroups of N" in Mathematics Magazine 48 (1975), 225-227, W. Sit and M. Siu showed that all such are finitely...
henriksen@...
Oct 12, 2004 4:23 am
235
Ahoj Venco, no to je legrace, zespolu komunikujeme takhle!!! Dostal jsem par odpovedi, jako ze uz to vedel Weierstrass..., ale kupodivu i konkretni clanek, kde...
Dear all, I am rather curious about Jirka Adamek's Subsemigroup question. Can we have a translation of the essence of what was exchanged in the previous...
mhebert
mhebert@...
Oct 12, 2004 10:55 am
238
The question posed by Adamek is appended. My response is the only one that gives an explicit reference, The others describe it as easy to show or give...
henriksen@...
Oct 12, 2004 3:39 pm
239
Here is the copy of J. Adamek's question that I forgot to append. MH Date: Fri, 08 Oct 2004 15:52:56 +0200 (CEST) From: Jiri Adamek <adamek@...> ...
henriksen@...
Oct 12, 2004 3:43 pm
240
... Sorry, my previous reaction was too vague (laziness, common laziness...) There was a reference to related results (provided by Melvin Henriksen). The Redei...
Boris M Schein
bschein@...
Oct 12, 2004 10:16 pm
241
A comment to my previous comments. I asked a friend who was interested in the subsemigroups of free commutative monoids. He is far from home and cannot look up...
Boris M Schein
bschein@...
Oct 13, 2004 3:28 pm
242
Here is a question that Stephen Bloom asked me to place on this list. You may reply to him at bloom@.... Are there charaterization theorems for...
Walter Taylor
wtaylor@...
Nov 3, 2004 4:33 am
243
... There is something missing in the definition (links please). What is v ? Apparently v is an interpretation on a groupoid of the original terms. A. Mani ...
... v = var. All Steve is saying here is that an equation is super-regular when (a) the two sides have the same "fringe," meaning the same list of variables...
Vaughan Pratt
pratt@...
Nov 4, 2004 7:20 am
245
I just noticed that my last sentence, ... conflicts with Steve's no-repetition rule. The spirit of that restriction might survive under the condition that...
Vaughan Pratt
pratt@...
Nov 4, 2004 10:02 am
246
A Mani wrote: ``There is something missing in the definition (links please). What is v ? Apparently v is an interpretation on a groupoid of the original terms....
Matt is correct. Mani wrote: ``There is something missing in the definition (links please). What is v ? Apparently v is an interpretation on a groupoid of the...
(actually not Walter's definition. I merely copied what was sent to me.) wt...
Walter Taylor
wtaylor@...
Nov 4, 2004 3:28 pm
249
Subject: 2006 AMS/MAA Special Session Greetings one and all, We (John Snow and Japheth Wood) are considering organizing a special session at the January...
Every ideal of a boolean algebra B is a sublattice of B. Is it a boolean sub algebra of B.If not Can you direct me to give an exaple in this case. with regds ...
... Hint: The ideal is a sublattice if you define "lattice" in a weak sense of having binary meets and joins. Is it still a sublattice if you define "lattice"...
Steve Vickers
s.j.vickers@...
Nov 18, 2004 11:05 am
253
Freredejesus asked about homogeneous algebras. I had never heard of them before (although it seems I probably should have...). They do not turn out to be...
Srinivasa Rao Tanniru asked if every ideal of a boolean algebra is a boolean subalgebra. The answer is very strongly no. Consider the ideals of the power set...
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