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arxiv: 1104.0907 · v1 · pith:YJWQNW6Dnew · submitted 2011-04-05 · 🧮 math.RT

Weyl group action and semicanonical bases

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keywords algebragroupsemicanonicalweylactionactsadditionbases
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Let U be the enveloping algebra of a symmetric Kac-Moody algebra. The Weyl group acts on U, up to a sign. In addition, the positive subalgebra U^+ contains a so-called semicanonical basis, with remarkable properties. The aim of this paper is to show that these two structures are as compatible as possible.

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