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Proof step 49 from proof nextl-nextj-lemma-butlast (previous step)

∃ lf, jj. lf(0) = a ' ∧ jj(0) = n0 ∧ (∀ n. n ≤ m0 → lf(n + 1) = nextl(jj(n), lf(n).last) ∧ jj(n + 1) = nextj(jj(n), lf(n).last)) ⊦ ∃ lf, jj. lf(0) = a ' ∧ jj(0) = n0 ∧ (∀ n. n ≤ m0 + 1 → lf(n + 1) = nextl(jj(n), lf(n).last) ∧ jj(n + 1) = nextj(jj(n), lf(n).last))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 50:
lf(0) = a ', ∀ n. n ≤ m0 → lf(n + 1) = nextl(jj(n), lf(n).last) ∧ jj(n + 1) = nextj(jj(n), lf(n).last) ⊦ ∃ lf, jj0. lf(0) = a ' ∧ jj0(0) = jj(0) ∧ (∀ n. n ≤ m0 + 1 → lf(n + 1) = nextl(jj0(n), lf(n).last) ∧ jj0(n + 1) = nextj(jj0(n), lf(n).last))

Proof step 49 from proof nextl-nextj-lemma-butlast (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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