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Proof step 3 from proof size-rmdup-del (previous step)

a ∈ [] ⊦ # rmdup([] -l a) = # rmdup([]) - 1

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: del-e: ⊦ [] -l a = [];% ⊦ ¬ a ∈ []; (s)% ⊦ # [] = 0; (s)% ⊦ rmdup([]) = []; (s)