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Proof step 6 from proof rmdup (previous step)

a ∈ x, ∀ a. ¬ a ∈ rmdup(x) ⊦

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: a

Additional information

Used simplifier rules: rm-in-03: ⊦ ¬ a ∈ rmdup(x) → ¬ a ∈ x; (forward) from specification list-dup Used terms: a