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An analytic class number type formula for PSL2(Z)

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An analytic class number type formula for PSL2(Z)
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43
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CC Attribution - NonCommercial - NoDerivatives 4.0 International:
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For any Fuchsian subgroup Γ⊂PSL2(R) of the first kind, Selberg introduced the Selberg zeta function in analogy to the Riemann zeta function using the lengths of simple closed geodesics on Γ∖H instead of prime numbers. In this talk, we report on a formula that determines the special value at s=1 of the derivative of the Selberg zeta function for Γ=PSL2(Z). This formula is obtained as an application of a generalized Riemann-Roch isometry for the trivial sheaf on ¯Γ∖H, equipped with the Poincaré metric. This is joint work with Gerard Freixas.