Eichler–Shimura congruence relation

Not to be confused with Eichler–Shimura isomorphism.

In number theory, the Eichler–Shimura congruence relation expresses the local L-function of a modular curve at a prime p in terms of the eigenvalues of Hecke operators. It was introduced by Eichler (1954) and generalized by Shimura (1958). Roughly speaking, it says that the correspondence on the modular curve inducing the Hecke operator T_p is congruent mod p to the sum of the Frobenius map Frob and its transpose Ver. In other words,

T_p = Frob + Ver

as endomorphisms of the Jacobian J₀(N)_{F_p} of the modular curve X₀N over the finite field F_p.

The Eichler–Shimura congruence relation and its generalizations to Shimura varieties play a pivotal role in the Langlands program, by identifying a part of the Hasse–Weil zeta function of a modular curve or a more general modular variety with the product of Mellin transforms of weight 2 modular forms or a product of analogous automorphic L-functions.

References

Eichler, Martin (1954), "Quaternäre quadratische Formen und die Riemannsche Vermutung für die Kongruenzzetafunktion", Archiv für mathematische Logik und Grundlagenforschung 5: 355–366, doi:10.1007/BF01898377, ISSN 0003-9268, MR 0063406
Ilya Piateckii-Shapiro, Zeta functions of modular curves, in Modular functions of one variable II (Antwerp 1972), Lecture Notes in Mathematics, 349, pp. 317–360
Shimura, Goro (1958), "Correspondances modulaires et les fonctions ζ de courbes algébriques", Journal of the Mathematical Society of Japan 10: 1–28, doi:10.4099/jmath.10.1, ISSN 0025-5645, MR 0095173
Goro Shimura, Introduction to the arithmetic theory of automorphic functions, Publ. of Math. Soc. of Japan, 11, 1971

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