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Proof step 5 from proof nextl-lemma-butlast (previous step)

∀ n. lfgen(n)(0) = a ' ∧ (∀ m. m < n → lfgen(n)(m + 1) = nextl(m, lfgen(n)(m).last)) ⊦ lfgen(0)(0) = a ' ∧ (∀ n. lfgen(n + 1)(n + 1) = nextl(n, lfgen(n)(n).last))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 6:
∀ n. lfgen(n)(0) = a ' ∧ (∀ m. m < n → lfgen(n)(m + 1) = nextl(m, lfgen(n)(m).last)) ⊦ lfgen(0)(0) = a ' ∧ lfgen(n + 1)(n + 1) = nextl(n, lfgen(n)(n).last)

Proof step 5 from proof nextl-lemma-butlast (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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