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theorem proved term proof

cubicDeficit_singleton

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formal statement (Lean)

 128theorem cubicDeficit_singleton {n : ℕ} (L : EdgeLengthField n)
 129    (i j : Fin n) (w : ℝ) (hw : 0 ≤ w) :
 130    cubicDeficit L (singletonHinge i j w hw)
 131    = (recoverEps L i - recoverEps L j) ^ 2 := by

proof body

Term-mode proof.

 132  show (match (singletonHinge i j w hw).edges with
 133        | [(i', j')] => (recoverEps L i' - recoverEps L j') ^ 2
 134        | _ => 0) = _
 135  rw [singletonHinge_edges]
 136
 137/-- Value of `cubicArea` on a singleton hinge. -/

used by (1)

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depends on (14)

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