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QCLib/Data/Fin/Digits.lean

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@@ -99,8 +99,8 @@ lemma val_ofDigitsBE_rec' (f : Fin (n + 1) → Fin d) :
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theorem ofDigits_ofDigitsBE_rec (f g : Fin (n + 1) → Fin d) :
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(g.ofDigits : ℕ) * f.ofDigitsBE =
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d * (init g).ofDigits* (init f).ofDigitsBE
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+ f (last n) * g.ofDigits
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d * (init g).ofDigits * (init f).ofDigitsBE
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+ f (last n) * g.ofDigits
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+ g (last n) * (init f).ofDigitsBE * d ^ (n + 1) := by
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rw [val_ofDigits_rec' g, val_ofDigitsBE_rec' f]
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ring

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