Mathematics – Representation Theory
Scientific paper
2010-11-30
Mathematics
Representation Theory
40 pages, 2 figures, 1 table
Scientific paper
We introduce the notion of ideal triangle in the Bruhat-Tits building associated to a split group -- it is analogous to the usual notion of triangle, but one vertex is "at infinity" in a certain direction. We prove that the algebraic variety of based ideal triangles with prescribed side-lengths is naturally isomorphic to a suitable variety of genuine triangles. From theorems pertaining to genuine triangles, we deduce saturation theorems related to branching to Levi subgroups and to the constant term homomorphisms.
Haines Thomas J.
Kapovich Michael
Millson John J.
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