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theorem proved term proof

composite_refines_left

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formal statement (Lean)

  68theorem composite_refines_left (r₁ : Recognizer C E₁) (r₂ : Recognizer C E₂)
  69    {c₁ c₂ : C} (h : Indistinguishable (r₁ ⊗ r₂) c₁ c₂) :
  70    Indistinguishable r₁ c₁ c₂ :=

proof body

Term-mode proof.

  71  ((composite_indistinguishable_iff r₁ r₂ c₁ c₂).mp h).1
  72
  73/-- If configs are indistinguishable under composite, they are under r₂ -/

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depends on (2)

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