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Proof step 2 from proof payload-drop-upper (previous step)

n ≤ # zbrar, m + nused ≤ n ⊦ payload(zbrar[n, zbr], m, nused) = payload(zbrar, m, nused)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
m + nused ≤ n, n ≤ # zbrar, m + nused ≤ # zbrar ⊦ payload(zbrar[n, zbr], m, nused) = payload(zbrar, m, nused)

Rule argument

Additional information

Used simplifier rules: let: ⊦ n ≤ n0 ∧ n0 ≤ n1 → n ≤ n1; (forward) from specification nat