Geodesic
Euler products for congruence subgroups of the Siegel group of genus $2$
Sbornik. Mathematics, Tome 28 (1976) no. 4, pp. 431-458 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper the construction is begun of a theory of Dirichlet series with Euler expansion which correspond to analytic automorphic forms for congruence subgroups of the integral symplectic group of genus $2$. Namely, for an arbitrary positive integer $q$ a connection is revealed between the eigenvalues $\lambda_F(m)$ of an eigenfunction $F\in\mathfrak M_k\bigl(\Gamma_2(q)\bigr)$ of all the Hecke operators $T_k(m)$ ($(m,q)=1$), where $\Gamma_2(q)$ is the principal congruence subgroup of degree $q$ of the group $\Gamma_2=\operatorname{Sp}_2(\mathbf Z)$, and its Fourier coefficients. This connection can be written in the language of Dirichlet series in the form of identities; here an infinite sequence of identities arises, indexed by classes of positive definite integral primitive binary quadratic forms equivalent modulo the principal congruence subgroup of degree $q$ of $\operatorname{SL}_2(\mathbf Z)$. Bibliography: 15 titles. 
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     author = {S. A. Evdokimov},
     title = {Euler products for congruence subgroups of the {Siegel} group of genus~$2$},
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     volume = {28},
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     url = {http://geodesic.mathdoc.fr/item/SM_1976_28_4_a0/}
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S. A. Evdokimov. Euler products for congruence subgroups of the Siegel group of genus $2$. Sbornik. Mathematics, Tome 28 (1976) no. 4, pp. 431-458. http://geodesic.mathdoc.fr/item/SM_1976_28_4_a0/

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