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Proof step 1 from proof payload-copy-right-upper (conclusion)

n + nused < # zbrar ⊦ payload(copy(zbrar, n, zbrar, n + 1, nused), n + 1, nused) = payload(zbrar, n, nused)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 2:
n + nused < # zbrar ⊦ payload(copy(zbrar, n, zbrar, n + 1, nused), n + 1, nused) = payload(zbrar, n, nused)

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic