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Proof step 2 from proof lebs-write-last (previous step)

# buf = LEB_SIZE, n + m + 1 ≤ # avol ⊦ lebs(avol[n + m, mapped(buf)], n, m + 1) = lebs(avol, n, m) + buf

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 3:
# buf = LEB_SIZE, n + m < # avol ⊦ lebs(avol[n + m, mapped(buf)], n, m + 1) = lebs(avol, n, m) + buf

Rule argument

Additional information

Used simplifier rules: ⊦ m < n → n ≠ 0; (s)%f: ⊦ m < n → n ≠ 0; (forward) from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ m + 1 ≤ n ↔ m < n; (s)