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theorem proved term proof

winding_additive

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formal statement (Lean)

  92theorem winding_additive (w₁ w₂ : WindingData) (hw : w₁.center = w₂.center)
  93    (hr : w₁.radius = w₂.radius) :
  94    ∃ w : WindingData, w.charge = w₁.charge + w₂.charge ∧
  95      w.center = w₁.center ∧ w.radius = w₁.radius :=

proof body

Term-mode proof.

  96  ⟨{ center := w₁.center, radius := w₁.radius, radius_pos := w₁.radius_pos,
  97     charge := w₁.charge + w₂.charge }, rfl, rfl, rfl⟩
  98
  99/-- The winding of a reciprocal negates the charge. -/

used by (4)

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depends on (11)

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