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Proof step 2 from proof maxScale-zero-01 (previous step)

(i / 10 ^ maxScale(i)) % 10 = 0 ⊦ i = 0

User applied rule induction

And obtained the following new goals

Proof step 3:
(i / 10 ^ maxScale(i)) % 10 = 0, ∀ i0. i→n(i0) < i→n(i) → (i0 / 10 ^ maxScale(i0)) % 10 = 0 → i0 = 0 ⊦ i = 0

Rule argument

indvar: i→n(i) wfpred: <

Additional information

Used simplifier rules: <; (wellfounded) Used terms: i→n(i)