Letter to Godement
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Editorial comments: The letter to Weil that saw the birth of the L-group was written in January 1967. Somewhat later that same year, Roger Godement asked Langlands to comment on the Ph.D. thesis of Hervé Jacquet. His reply included a number of conjectures on Whittaker functions for both real and p-adic reductive groups. These were later to be proven, first in the p-adic case by Shintani for GLn and Casselman Shalika in general, and much later in the real case by a longer succession of people.