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theorem proved term proof

xHessianEntry_offDiag

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formal statement (Lean)

  39theorem xHessianEntry_offDiag {n : ℕ} (α x : Vec n) {i j : Fin n} (hij : i ≠ j) :
  40    xHessianEntry α x i j
  41      = ((aggregate α x + (aggregate α x)⁻¹) / 2) * xDirection α x i * xDirection α x j := by

proof body

Term-mode proof.

  42  unfold xHessianEntry xDiagonalCorrection
  43  simp [hij]
  44

depends on (5)

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