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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