T. Kobayashi, DISCRETE DECOMPOSABILITY OF THE RESTRICTION OF A(Q)(LAMBDA) WITH RESPECT TO REDUCTIVE SUBGROUPS II - MICRO-LOCAL ANALYSIS AND ASYMPTOTIC K-SUPPORT, Annals of mathematics, 147(3), 1998, pp. 709-729
Let G' subset of G be real reductive Lie groups. This paper offers a c
riterion on the triplet (G, G', pi) that the irreducible unitary repre
sentation pi of G splits into a discrete sum of irreducible unitary re
presentations of a subgroup G' when restricted to G', each of finite m
ultiplicity. Furthermore, we shall give an upper estimate of the multi
plicity of an irreducible unitary representation of G' occurring in pi
\(G').