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Proof step 14 from proof firstN-lastN (previous step)

# x0 = m + n, ∀ n0, n. # x0 = n0 + n → firstn(n0, x0) + restn(n0, x0) = x0 ⊦ firstn(m, x0) + restn(m, x0) = x0

Heuristic quantifier closing applied rule all left

And closed the goal!

Rule argument

pos: left 2 terms: m, n

Additional information

Used terms: m, n