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Proof step 3 from proof lapp (previous step)

⊦ (x + y).last = y.last, y = []

Heuristic structural induction applied rule structural induction

And closed the goal!

Rule argument

term: y

Additional information

Used simplifier rules: lapp-01: ⊦ (x + a ' + y).last = (a ' + y).last;%list freely generated by [], +;;% ⊦ a + x = a ' + x; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list