`BookProof.MixedLinearEsa.hasDerivAt_polyPhase_line` (c : ℕ → ℝ) (n : ℕ) {m : V} (hm : m ≠ 0) (x : V) : HasDerivAt (fun t : ℝ => polyPhase c n m (x + t • m)) (-(polyPotential c n m

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`BookProof.MixedLinearEsa.hasDerivAt_polyPhase_line` (c : ℕ → ℝ) (n : ℕ) {m : V} (hm : m ≠ 0) (x : V) : HasDerivAt (fun t : ℝ => polyPhase c n m (x + t • m)) (-(polyPotential c n m · Prove2Me