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Proof step 6 from proof rm-notin-01 (previous step)

rmdup(x) = y + a ' + z, a ∈ y, a ∈ x ⊦ dups(rmdup(x))

User applied rule insert equation

And closed the goal!

Rule argument

pos: left 1 flags: discard

Additional information

Used simplifier rules: in-04-01: ⊦ a ∈ x → dups(x + a ' + y);%a: ⊦ (x + y) + z = x + y + z; from specification list