Realizations of Weyl groups on ellipsoids

Details Realizations of Weyl groups on ellipsoids Realizations of Weyl groups on ellipsoids

2011-09-12

arxiv.org/abs/1109.2512v1

Mathematics

Representation Theory

4 pages, short note

Scientific paper

For any finite-dimensional complex semisimple Lie algebra two ellipsoids (primary and secondary) are considered. The equations of these ellipsoids are Diophantine equations and the Weyl group acts on the sets of all their Diophantine solutions. This provides two realizations (primary and secondary) of the Weyl group. The primary realization suggests an order on the Weyl group, which is useful for an exploration of the Bruhat order. The secondary realization is useful for finding for any element of the Weyl group all of its reduced expressions, which implies another realization of the Bruhat order.

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