Base change for GL(2)
Robert P. Langlands
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The problem of base change or of lifting for automorphic representations can be introduced in several ways. It emerges very quickly when one pursues the formal principles expounded in the article 20 which can in fact be reduced to one, viz., the functoriality of automorphic forms with respect to what is now referred as the L-group.
Publisher:
Princeton University Press
Series:
Annals of mathematics studies 96