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feat(ModularForms/JacobiTheta): derivative of theta function (#11824)
This is a rewrite of `JacobiTheta/TwoVariable.lean`, adding a number of new results needed for Hurwitz and Dirichlet L-series. The main addition is developing the theory of the `z`-derivative of the theta function, as an object of study in its own right (functional equations, periodicity, holomorphy etc) – this is needed to prove analytic continuation + functional equations for odd Dirichlet characters. We also add a number of new results about the existing `jacobiTheta2` function: - converses of all the convergence statements (showing the series are *never* convergent if tau is outside the upper half-plane), which allows hypotheses to be removed from several results further downstream - differentiability in both variables jointly, not just each variable separately as before.
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