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Oct 16, 2015 at 13:59 vote accept user42690
Oct 16, 2015 at 6:18 comment added David Loeffler No, it is much more powerful than just multiplying by Eisenstein series, because it's showing that there are eigenforms of weight $k'$ highly congruent to $f$, not just any old forms of that weight.
Oct 16, 2015 at 3:51 comment added user42690 And is there no way prove this theorem without constructing the eigencurve? At least if $j=0$ it's just multiplying with the Hasse invariant (Eisenstein series I mean). Maybe I shall post another MO question......
Oct 16, 2015 at 2:30 comment added user42690 Thanks, David. It seems that the eignnvariety machine really visualizes properties of modular forms. But this result seems different from the results I know (basically Shimura or Hida's). So is it possible to deduce Shimura's (In A tameness criterion for Galois representations associated to modular forms (mod p) by Gross proposition 9.3 p. 478., Between weight k and weight 2) or Hida's results (between modular forms of same wight I think)?
Oct 15, 2015 at 18:41 history answered David Loeffler CC BY-SA 3.0