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Proof step 8 from proof zero (previous step)

i ^ i0 = 0, 0 ≤ i0, ∀ j0, i. i→n(j0) < i→n(i0 +1) → 0 < j0 → (i ^ j0 = 0 ↔ i = 0) ⊦ i = 0

User applied rule apply induction

And closed the goal!

Rule argument

subst: [j0, i] → [i0, i]

Additional information

Used simplifier rules: Pot-zero: ⊦ j ^ 0 = 1;% ⊦ i < j ↔ ¬ j ≤ i; (ss)% ⊦ i ≤ j → (j ≤ i ↔ i = j); (s)% ⊦ i +1 = i + 1; (s)% ⊦ 0 ≤ i → i→n(i + 1) = i→n(i) + 1; (s)%add-a: ⊦ i + j + i0 = (i + j) + i0; from specification int-basic2%add-c: ⊦ i + j = j + i; from specification int-basic2% ⊦ m < n + 1 ↔ ¬ n < m; (s)% ⊦ i→n(i) < i→n(j) ↔ abs(i) < abs(j); (s)% ⊦ 0 ≤ i → abs(i) = i; (s)% ⊦ ¬ i < i; (s)%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic Used terms: i0, i