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Proof step 8 from proof lastdiv (previous step)

⊦ ∃ y, a0. a ' = y + a0 '

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 1 terms: [], a

Additional information

Used simplifier rules: Nil: ⊦ [] + x = x;%a: ⊦ (x + y) + z = x + y + z;%c-04: ⊦ a ' = b ' ↔ a = b; Used terms: [], a