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theorem proved term proof

pointInterface_away

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formal statement (Lean)

 105theorem pointInterface_away {K : Type*} {x₀ y : K} (h : y ≠ x₀) :
 106    (pointInterface x₀).observe y = (0 : Fin 2) := by

proof body

Term-mode proof.

 107  unfold pointInterface
 108  simp [h]
 109
 110/-- The point interface separates any point from any distinct point. -/

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