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Proof step 3 from proof mk-two (previous step)

⊦ mklist(a, 0) + mklist(a, 2) = a ' + a ' + mklist(a, 0)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 4:
⊦ mklist(a, 2) = a ' + a '

Rule argument

Additional information

Used simplifier rules: mk-zero: ⊦ mklist(a, 0) = [];%app: ⊦ x + [] = x; from specification list%a: ⊦ (x + y) + z = x + y + z; from specification list%Nil: ⊦ [] + x = x; from specification list