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Aug 19, 2018 at 23:20 comment added GH from MO If you like my answer, please accept it officially (so that it turns green). Thanks in advance!
Oct 27, 2014 at 7:04 answer added GH from MO timeline score: 3
Oct 27, 2014 at 6:05 comment added Asaf If I recall correctly, Hejhal's book starts dealing with uniform lattices first, where Iwaniec's deals with the general case (hence the truncation of the form to project it into the cuspidal spectrum). There is a general theorem of Gelfand-Graev-PS that restriction of convolution operators (those point-pair invariants in Selberg's terminology) over the cuspidal spectrum is compact.
Oct 27, 2014 at 4:25 history asked M.Souf CC BY-SA 3.0