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Proof step 2 from proof oc-del (previous step)

#oc(a, x) < #oc(a, x -1l b), a ∈ x -1l b, a ∈ x ⊦

User applied rule insert rewrite lemma

And obtained the following new goals

Rule argument

spec: list-perm inst: name: del1-01 seq: ⊦ a ≠ b → #oc(a, x -1l b) = #oc(a, x) subst: [b, x, a] → [b, x, a] flags: rewrite, current

Additional information

Used simplifier rules: del1: ⊦ a ∈ x → #oc(a, x -1l a) = #oc(a, x) -1;%in-05: ⊦ a ∈ x → #oc(a, x) ≠ 0;%ref-1: ⊦ ¬ n < n; from specification nat-basic1%pred-03: ⊦ n -1 = n - 1; from specification nat%lels-01: ⊦ ¬ m ≤ n ↔ n < m; from specification nat%one-01: ⊦ m < 1 ↔ m = 0; from specification nat-basic1%ls: n0 ≤ n ⊦ m < n - n0 ↔ m + n0 < n; 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: b, x, a