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Proof step 3 from proof first-mklist-03 (previous step)

⊦ firstn(m, mklist(a, n + m)) = mklist(a, m)

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-del inst: name: first-mklist seq: ⊦ m ≤ n → firstn(m, mklist(a, n)) = mklist(a, m) subst: [n, a, m] → [n + m, a, m] flags: rewrite, current

Additional information

Used simplifier rules: lels-01: ⊦ ¬ m ≤ n ↔ n < m; from specification nat%l-02: ⊦ ¬ m + n < m; from specification nat-basic2%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic2%c: ⊦ m + n = n + m; from specification nat-basic2 Used terms: n + m, a, m