Coefficients and Periods of Cusp Forms on SL2(Z)
In pioneering work, Eichler [E 2] discovered relations between periods of cusp forms, extended by Shimura [Sh 1]. Manin [Man 4] made more explicit the connection of these relations with the coefficients in the q-expansion, by using the Hecke operators and continued fractions, and in this chapter, we reproduce part of his paper, after stating the Eichler-Shimura relations.
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