`BookProof.MixedLinearEsa.hasDerivAt_phaseFun_line` {W θ : V → ℝ} {m : V} (hθd : ∀ x, HasDerivAt (fun t : ℝ => θ (x + t • m)) (-(W x)) 0) (x : V) : HasDerivAt (fun t : ℝ => phaseFu

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`BookProof.MixedLinearEsa.hasDerivAt_phaseFun_line` {W θ : V → ℝ} {m : V} (hθd : ∀ x, HasDerivAt (fun t : ℝ => θ (x + t • m)) (-(W x)) 0) (x : V) : HasDerivAt (fun t : ℝ => phaseFu · Prove2Me