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Proof step 2 from proof valid-eraseq-stronger-next-append-none (previous step)

m < # apebs, valid-eraseq-stronger(subarray(apebs, 0, m), q) ⊦ valid-eraseq-stronger(subarray(apebs, 0, m + 1), q + eq-entry(m, none) ') ↔ ¬ valid-peb(apebs[m])

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
m < # apebs, valid-eraseq-stronger(subarray(apebs, 0, m), q) ⊦ valid-eraseq-stronger(subarray(apebs, 0, m + 1), q + eq-entry(m, none) ') ↔ ¬ valid-peb(apebs[m])

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic