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Jun 29, 2011 at 2:36 comment added Ramsey Yeah, I seem to be missing said cleverness at the moment as well! At any rate, I thought I pass along $D$ in case you didn't know it, but it seems that you do. Incidentally, I now recall where I got the name of that operator. It was from Katz's "$p$-adic interpolation of real analytic Eisenstein series" where it is called the Halphen-Fricke operator, not the Halperin-Fricke operator.
Jun 29, 2011 at 0:02 comment added charris Thanks for the response Ramsey. I did have that in mind for the formulas for $E_4'$ and $E_6'$. I iterated those formulas then to find the others. What I'm really missing is the cleverness :) I've heard this $D$ called the Serre derivative also.
Jun 28, 2011 at 23:33 history answered Ramsey CC BY-SA 3.0