Math

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 \(\mathrm{GL}_n\) and Casselman Shalika in general, and much later in the real case by a longer succession of people.