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Proof step 13 from proof perm-all (previous step)

#oc(a, x) = #oc(a, y), #oc(a0, x) < #oc(a0, y), a0 ∈ y, ∀ a. a ∈ x ∨ a ∈ y → #oc(a, x) = #oc(a, y), a ∈ x ∨ a ∈ y ⊦

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 4 terms: a0

Additional information

Used simplifier rules: lf-02: ⊦ m < n ∧ m = n0 → n0 < n; (forward) from specification nat-basic1%lf-01: ⊦ m < n ∧ n = n0 → m < n0; (forward) from specification nat-basic1%ref-1: ⊦ ¬ n < n; from specification nat-basic1 Used terms: a0