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theorem proved term proof

chartCompatible_refl

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formal statement (Lean)

 109theorem chartCompatible_refl (φ : RecognitionChart L r n) :
 110    ChartCompatible L r φ φ := by

proof body

Term-mode proof.

 111  intro c h₁ h₂
 112  -- h₁ and h₂ are both proofs that c ∈ φ.domain, so they must give same result
 113  rfl
 114
 115/-- Chart compatibility is symmetric -/

depends on (10)

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