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Character Identities in the Twisted Endoscopy of Real Reductive Groups

Suppose G is a real reductive algebraic group, ? is an automorphism of G, and ? is a quasicharacter of the group of real points G(R). Under some additional assumptions, the theory of twisted endoscopy associates to this triple real reductive groups H. The Local Langlands Correspondence partitions the admissible representations of H(R) and G(R) into L-packets. The author proves twisted character identities between L-packets of H(R) an...