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theorem proved term proof

pattern3_injective

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formal statement (Lean)

 126theorem pattern3_injective : Function.Injective pattern3 := by

proof body

Term-mode proof.

 127  intro a b hab
 128  apply Fin.ext
 129  have hNat : toNat3 (pattern3 a) = toNat3 (pattern3 b) := congrArg toNat3 hab
 130  simpa [toNat3_pattern3] using hNat
 131

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