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Mar 19, 2011 at 19:46 comment added Alexander Braverman I am actually trying to deal with affine Kac-Moody groups.
Mar 18, 2011 at 4:50 comment added B R You mentioned the other "critical component", of course :) Your comment seems to imply that you are interested in continuing not-necessarily-cuspidal-data Eisenstein series (maybe even non-${\mathfrak z}(g)$-finite?). I think that would be an MO-worthy question in itself. I wouldn't have much coherent to add to that discussion, but maybe someone else would.
Mar 18, 2011 at 2:16 comment added Alexander Braverman Also I tried to read Selberg's original proof in his ICM paper and didn't understand it. I think that Sarnak couldn't understand it either and he rewrote it a little (using slightly different idea). Selberg's original proof remains a mystery for me.
Mar 18, 2011 at 2:15 comment added Alexander Braverman Actually, in the situation I have to deal with, the "critical component" of Bernstein's proof turns out to be the property that in some domain the system has unique solution. In any case, Moeglin-Waldspurger prove more than Bernstein - they give you some information about poles which Bernstein's proof has no chance to give. Thank you all very much!
Mar 17, 2011 at 17:33 comment added B R Also, it's not clear to me that these proofs don't implicitly prove the critical component needed to invoke Bernstein's continuation principle (that the parametrized system of equations has a locally finite-dimensional solution space).
Mar 17, 2011 at 8:10 comment added B R Looking around a bit more, Jacquet attributes Moeglin-Waldspurger's proof to Colin de Verdière, so that may be our answer. Thanks for the working link!
Mar 17, 2011 at 8:08 history edited B R CC BY-SA 2.5
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Mar 17, 2011 at 5:43 comment added Denis Chaperon de Lauzières The proof of Colin de Verdière is indeed very nice, and it would be very interesting to see how far it can generalize (it is written for subgroups of $SL_2(\mathbf{R})$ with a single cusp; the paper is available numdam.org/numdam-bin/fitem?id=AIF_1983__33_2_87_0 on Numdam.)
Mar 16, 2011 at 23:05 history answered B R CC BY-SA 2.5