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Harmonic analysis on semisimple Lie groups

Harish-Chandra
- 01 May 1970 - 
- Vol. 76, Iss: 3, pp 529-551
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TLDR
In this article, it was shown that for any representation x, VT and ©^ depend only on the class co of 7r, and that tr 4̂ is actually independent of the choice of this base.
Abstract
Then tr 4̂ is actually independent of the choice of this base. Let VT denote the set of a l l /G^ i (G) such that ir(f) is of the trace class. Then Vr is a linear subspace of Li(G). Put 0 . ( / ) = tr *•(ƒ) ( f £ F T ) . Then ®T is a linear function on VT which we may call the character of 7T. Of course this concept would be useful only when the space V* is fairly large. Let 8(G) denote the set of all equivalence classes of irreducible unitary representations of G. It is easy to see that for any representation x, VT and ©^ depend only on the class co of 7r. Hence we may de-

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