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Presentation by conjugation for $A_1$-type extended affine Weyl groups by Azam, Saeid; Sahsanaei, Valiollah is a scholarly article available to read on EtoBox.

What is Presentation by conjugation for $A_1$-type extended affine Weyl groups about?

There is a well-known presentation for finite and affine Weyl groups called the {\it presentation by conjugation}. Recently, it has been proved that this presentation holds for certain sub-classes of extended affine Weyl groups, the Weyl groups of extended affine root systems. In particular, it is shown that if nullity is $\leq 2$, an $A_1$-type extended affine Weyl group has the presentation by conjugation. We set up a general framework for the study of simply laced extended affine Weyl groups. As a result, we obtain certain necessary and sufficient conditions for an $A_1$-type extended affine Weyl group of arbitrary nullity to have the presentation by conjugation. This gives an affirmative answer to a conjecture that there are extended affine Weyl groups which are not presented by "presentation by conjugation".

Author

Azam, Saeid; Sahsanaei, Valiollah

Published

2006

Language

EN