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Proof step 2 from proof lastn-neq-02 (previous step)

lastn(n + 1, x) = a ' + y ⊦ # y = n

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
lastn(n + 1, x) = a ' + y ⊦ # y = n

Rule argument

Additional information

Used simplifier rules: ⊦ a ∈ b ' ↔ a = b; (s)% ⊦ a ∈ x + y ↔ a ∈ x ∨ a ∈ y; (s)%a: ⊦ (x + y) + z = x + y + z; from specification list%in-14: ⊦ a ' + x = y → a ∈ y; (forward) from specification list