Re: Semigroup problem
- From: José Carlos Santos <jcsantos@xxxxxxxx>
- Date: Sun, 11 May 2008 16:23:23 +0100
On 11-05-2008 15:41, marcjhg@xxxxxxxxx wrote:
Let * be a semigroup operation that satisfies the following
properties:
all z exists x exists y (x * y = z).
all x all y (F(x) * G(y) = y * x).
The problem is: prove that * is commutative or find a counterexample
(finite if it is possible) to this claim.
What are F and G?
Best regards,
Jose Carlos Santos
.
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