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Proof step 2 from proof mk-two (previous step)

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

User applied rule structural induction

And obtained the following new goals

Proof step 3:
⊦ mklist(a, 0) + mklist(a, 2) = a ' + a ' + mklist(a, 0)
Proof step 6:
∀ a. mklist(a, n0) + mklist(a, 2) = a ' + a ' + mklist(a, n0) ⊦ mklist(a, n0 +1) + mklist(a, 2) = a ' + a ' + mklist(a, n0 +1)

Rule argument

indvar: n

Additional information

Used simplifier rules: nat freely generated by 0, +1;;