《SL2(R)(英文版)》講述瞭：Starting with Bargmann's paPer on the tnhmte dimenslonal representattons olSL2（R），the theory of representations of semisimple Lie groups has evolved toa rather extensive production.Some of the main contributors have been：Gelfand-Naimark and Harish-Chandra.who considered the Lorentz group inthe late forties；Gelfand-Nalmark.who dealt with the classical complexgroups.while Harish·Chandra worked out the general reaI case。especiallythrough the derived representation of the Lie algebra.establishing thePlancherel formula （Gclfand-Graev also contributed to the teal case）；Cat-tan。Gelfand-Naimark.Godement.Harish.Chandra。who developed thetheory of spherical functions （Godement gave several Bourbaki seminarreports giving proofs for a number of spectral results not accessible other-wise）；Selberg，who took the group modulo a discrete subgroup and obtainedthe trace formula；Gelfand.Fomin，Piateckii.Shapiro，and Harish.Chandra，who established connections with automorphic forms；Jacquet-Lanlands，who pushed through the connection with L-series and Hecke.