`BookProof.WeylCauchyRiemann.deriv_slice_re` {ψ : ℂ → ℂ} (hψ : Differentiable ℝ ψ) (x y : ℝ) : deriv (fun t : ℝ => ψ ((t : ℂ) + y * Complex.I)) x = fderiv ℝ ψ ((x : ℂ) + y...

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`BookProof.WeylCauchyRiemann.deriv_slice_re` {ψ : ℂ → ℂ} (hψ : Differentiable ℝ ψ) (x y : ℝ) : deriv (fun t : ℝ => ψ ((t : ℂ) + y * Complex.I)) x = fderiv ℝ ψ ((x : ℂ) + y... · Prove2Me