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Proof step 1 from proof lastN-rec-01 (conclusion)

⊦ lastn(n + 1, x + a ') = lastn(n, x) + a '

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: lastN-rec: ⊦ lastn(n + 1, x) = lastn(n, x.butlast) + x.last;% ⊦ x + y = x + z ↔ y = z; (s)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ x + a = x + a '; (s)% ⊦ (x + a ').last = a; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list% ⊦ (x + a ').butlast = x; (s)