I'm looking for an exposition of the computation of the constant term of a non-holomorphic Eisenstein series associated to a discrete subgroup $\Gamma$ (or at least a congruence subgroup) of $SL(2,\mathbb Z)$, that is accessible to an advanced undergraduate. The more explicit the better.
2026-03-25 14:22:27.1774448547
Reference for the constant term of Eisenstein series on congruence/discrete subgroups
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