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Proof step 43 from proof refine-write (previous step)

LEB_SIZE = (n4 + n) + n0 + n2, avols[default-volid][m2] = mapped(buf0, n2), m2 < # avols[default-volid], ebm-cons(avols), ebm-vol-inv(abs(avols[default-volid])), is-aligned(n, EB_PAGE_SIZE), is-aligned(n0, EB_PAGE_SIZE), default-volid ∈ avols, n + n0 + n2 ≤ LEB_SIZE, n0 + n2 ≤ LEB_SIZE, n2 ≤ LEB_SIZE, n3 + n ≤ # buf, (n0 + n2) + n ≤ LEB_SIZE ⊦ mapped(subarray(buf0, 0, n2) + mkempbuf(n0) + subarray(buf, n3, n)) = abs(avols[default-volid][m2, mapped(subarray(buf0, 0, n0 + n2) + subarray(buf, n3, n) + mkempbuf(n4), (n0 + n2) + n)])[m2], n = 0

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 44:
⊦ n < # evol → abs(evol)[n] = abs(evol[n])
Proof step 45:
LEB_SIZE = (n4 + n) + n0 + n2, avols[default-volid][m2] = mapped(buf0, n2), m2 < # avols[default-volid], m2 < # avols[default-volid][m2, mapped(subarray(buf0, 0, n0 + n2) + subarray(buf, n3, n) + mkempbuf(n4), (n0 + n2) + n)], ebm-cons(avols), ebm-vol-inv(abs(avols[default-volid])), is-aligned(n0, EB_PAGE_SIZE), is-aligned(n, EB_PAGE_SIZE), default-volid ∈ avols, (n0 + n2) + n ≤ LEB_SIZE, n3 + n ≤ # buf, n2 ≤ LEB_SIZE, n0 + n2 ≤ LEB_SIZE, n + n0 + n2 ≤ LEB_SIZE ⊦ mapped(subarray(buf0, 0, n2) + mkempbuf(n0) + subarray(buf, n3, n)) = abs(avols[default-volid][m2, mapped(subarray(buf0, 0, n0 + n2) + subarray(buf, n3, n) + mkempbuf(n4), (n0 + n2) + n)][m2]), n = 0

Rule argument

spec: ebm-vol-abs name: abs-at seq: ⊦ n < # evol → abs(evol)[n] = abs(evol[n]) subst: [n, evol] → [m2, avols[default-volid] [m2, mapped ( subarray(buf0, 0, n0 + n2) + subarray(buf, n3, n) + mkempbuf(n4), (n0 + n2) + n) ]] flags: <all paths>

Additional information

Used simplifier rules: ⊦ v ∈ avols ∧ m < # avols[v] ∧ avols[v][m] = mapped(buf, m0) ∧ ebm-cons(avols) → # buf = LEB_SIZE; (s)% ⊦ m ≠ n → (m ≤ n ↔ m < n); (s)% ⊦ # evol[n, leb] = # evol; (s)% ⊦ m < n ↔ ¬ n ≤ m; (ss)% ⊦ m < n → (n ≤ m ↔ false); (s)%# buf = n ⊦ subarray(buf, 0, n) = buf; (s)%append-a: ⊦ (buf + buf0) + buf1 = buf + buf0 + buf1; from specification array-splice[buffer] Used terms: m2, avols[default-volid] [m2, mapped (subarray(buf0, 0, n0 + n2) + subarray(buf, n3, n) + mkempbuf(n4), (n0 + n2) + n) ]