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Proof step 1 from proof restn-prefix (conclusion)

⊦ # x = n → restn(n, x + x0) = x0

Heuristic simplifier applied rule simplifier

And closed the goal!

Rule argument

Additional information

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