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Mar 27, 2012 at 17:00 comment added paul garrett Right, the two senses of "residual" are essentially unrelated. The distinctions between cuspidal discrete spectrum and other parts ("residual") of the discrete spectrum are not (so far as I know) at the completely abstract spectral level, but are about the explicit construction or classification: cuspforms versus square-integrable residues of various Eisenstein series.
Mar 27, 2012 at 14:51 history asked Eren Mehmet Kiral CC BY-SA 3.0