Bass–Serre theory was developed by Jean-Pierre Serre in 1970s and formalized in Trees, Serre's seminal 1977 monograph (developed in collaboration with Hyman Bass) on the subject.
Translated by John Stillwell from "arbres, amalgames, SL2", written with the collaboration of Hyman Bass, 3rd edition, astérisque 46 (1983).
He introduced the concepts now known as Morita equivalence and Morita duality which were given wide circulation in the 1960s by Hyman Bass in a series of lectures.
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