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The 2,000th person to post in this thread wins!


ECURB

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2000 was a nice round number.

Funny thing is, any number is within ecurb's reach.

..and it's ratchet! Don't you have spell check? :bag:

How are we ever going to get to 2,000 posts in this thread with ecurb gone?

You guys are rough!

Glad I could spread the whoring... :lol:

I am actually not even close to being the biggest whore for once!

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Harish-Chandra character

From Wikipedia, the free encyclopedia

In mathematics, the Harish-Chandra character of a representation of a semisimple Lie group G on a Hilbert space H is a distribution on the group G that is analogous to the character of a finite dimensional representation of a compact group.

Definition

Suppose that π is an irreducible unitary representation of G on a Hilbert space H. If f is a compactly supported smooth function on the group G, then the operator on H

05ce9c5fe7168ae769be4d35cfd7aacc.png is of trace class, and the distribution

2cf976c72d568c87bb33ff82aab62aa4.png is called the character (or global character or Harish-Chandra character) of the representation.

The character Θπ is a distribution on G that is invariant under conjugation, and is an eigendistribution of the center of the universal enveloping algebra of G, in other words an invariant eigendistibution, with eigenvalue the infinitesimal character of the representation π.

Harish-Chandra's regularity theorem states that any invariant eigendistribution, and in particular any character of an irreducible unitary representation on a Hilbert space, is given by a locally integrable function.

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