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Proof step 61 from proof valid-peb-write-valid-peb (previous step)

# buf = LEB_SIZE, LEB_SIZE = n0 + m, LEB_SIZE = n1 + m0, apebs[n] = mkpeb(aehdr, avidhdr(v, m2, m4, m3, checksum(buf, m3)), buf, m, false), aehdr.valid?, m < LEB_SIZE, n < # apebs, m0 < LEB_SIZE, n4 < n1, is-aligned(m, EB_PAGE_SIZE), m3 ≤ LEB_SIZE, m3 ≤ datasize(buf), m ≤ m0, m ≤ n4 + m0, n4 + m0 - m < n0 → buf[m + (n4 + m0 - m)] = empty ⊦ buf[n4 + m0] = empty, aehdr = empty, m3 = 0, n0 = 0, m3 ≤ datasize(subarray(buf, 0, m0) + buf1) ∧ checksum(buf, m3) = checksum(subarray(buf, 0, m0) + buf1, m3)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 62:
# buf = LEB_SIZE, LEB_SIZE = n1 + m0, LEB_SIZE = n0 + m, apebs[n] = mkpeb(aehdr, avidhdr(v, m2, m4, m3, checksum(buf, m3)), buf, m, false), aehdr.valid?, n4 < n1, m0 < LEB_SIZE, n < # apebs, m < LEB_SIZE, is-aligned(m, EB_PAGE_SIZE), m ≤ n4 + m0, m ≤ m0, m3 ≤ datasize(buf), m3 ≤ LEB_SIZE, n0 ≤ (m0 - m) + n4 ⊦ buf[n4 + m0] = empty, aehdr = empty, m3 = 0, n0 = 0, m3 ≤ datasize(subarray(buf, 0, m0) + buf1) ∧ checksum(buf, m3) = checksum(subarray(buf, 0, m0) + buf1, m3)

Rule argument

Additional information

Used simplifier rules: ⊦ m < n ↔ ¬ n ≤ m; (ss)% ⊦ n ≤ n0 → (m + (n0 - n)) + n = m + n0; (s)%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ n ≤ m → m + n0 - n = (m - n) + n0; (s)