OAI/NumberTheory/CubicMoment/Theta/CubicThetaInversionHorizontalDerivative.lean

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The horizontal differential of inversion at the centre of a cusp. It conjugates the direction, with zero first-order vertical variation.

  1. theorem OAI.CubicFirstMoment.cubicThetaInversion_horizontal_hasDerivAt line 11