[Imprint][Data Privacy Statement][E-Mail]

View long theorem info. View the proof. Back to main index. View the specification. View theorem base summary, View theorem base listing, the used properties by spec, the dependency list, the symbol table,

Proof step 55 from proof valid-peb-write-valid-peb (previous step)

# 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?, m0 < LEB_SIZE, n < # apebs, n2 < LEB_SIZE, m < LEB_SIZE, is-aligned(m, EB_PAGE_SIZE), m ≤ n2, m0 ≤ n2, m ≤ m0, m3 ≤ datasize(buf), m3 ≤ LEB_SIZE, ∀ n3. n3 < n0 → buf[m + n3] = empty ⊦ buf[n2] = (subarray(buf, 0, m0) + mkempbuf(n1))[n2], aehdr = empty, m3 = 0, n0 = 0, n1 = 0, m3 ≤ datasize(subarray(buf, 0, m0) + buf1) ∧ checksum(buf, m3) = checksum(subarray(buf, 0, m0) + buf1, m3)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 56:
⊦ # buf ≤ n ∧ n < # buf + # buf0 → (buf + buf0)[n] = buf0[n - # buf]
Proof step 57:
# 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, n2 < LEB_SIZE, n < # apebs, m0 < LEB_SIZE, n2 < # subarray(buf, 0, m0) + # mkempbuf(n1), is-aligned(m, EB_PAGE_SIZE), m3 ≤ LEB_SIZE, m3 ≤ datasize(buf), m ≤ m0, m0 ≤ n2, m ≤ n2, # subarray(buf, 0, m0) ≤ n2, ∀ n3. n3 < n0 → buf[m + n3] = empty ⊦ buf[n2] = mkempbuf(n1)[n2 - # subarray(buf, 0, m0)], aehdr = empty, m3 = 0, n0 = 0, n1 = 0, m3 ≤ datasize(subarray(buf, 0, m0) + buf1) ∧ checksum(buf, m3) = checksum(subarray(buf, 0, m0) + buf1, m3)

Rule argument

spec: array-splice, inst: buffer name: append-at2 seq: ⊦ # buf ≤ n ∧ n < # buf + # buf0 → (buf + buf0)[n] = buf0[n - # buf] subst: [n, buf0, buf] → [n2, mkempbuf(n1), subarray(buf, 0, m0)] flags: <all paths>

Additional information

Used simplifier rules: ⊦ # subarray(buf, m, n) = n; (s)% ⊦ # mkempbuf(n) = n; (s)% ⊦ m < n ↔ ¬ n ≤ m; (ss)%c: ⊦ m + n = n + m; from specification nat-basic%fle-01: ⊦ m ≤ n ∧ n < n0 → m < n0; (forward) from specification nat%fle: ⊦ m < n ∧ n ≤ n0 → m < n0; (forward) from specification nat%let: ⊦ n ≤ n0 ∧ n0 ≤ n1 → n ≤ n1; (forward) from specification nat% ⊦ ¬ n < n; (s)%# buf = n ⊦ subarray(buf, 0, n) = buf; (s) Used terms: n2, mkempbuf(n1), subarray(buf, 0, m0)