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Proof step 1 from proof firstn-app-exact (conclusion)

⊦ n = # x → firstn(n, x + y) = x

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

Used simplifier rules: firstN-len: ⊦ firstn(# x, x + y) = x;%a: ⊦ (x + y) + z = x + y + z; from specification list