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Proof step 1 from proof lastn-lastn (conclusion)

⊦ lastn(n, lastn(n, x)) = lastn(n, x)

User applied rule structural induction

And obtained the following new goals

Proof step 2:
∀ x. lastn(n0, lastn(n0, x)) = lastn(n0, x) ⊦ lastn(n0 +1, lastn(n0 +1, x)) = lastn(n0 +1, x)

Rule argument

indvar: n

Additional information

Used simplifier rules: lastN-zero: ⊦ lastn(0, x) = [];%nat freely generated by 0, +1;;