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Proof step 19 from proof write-inv-post (previous step)

files1 -- ino = files0 -- ino, files0[ino] = mkfile(m1, md1, n2, content0), files1[ino] = mkfile(m1, md1, # links(ino, dirs), content1), content0.stream from m1 = σ⊥, n3 < m1, afs-cons(dirs, files1), ino ∈ files1, ino ∈ files0, n0 ≤ n1, n1 ≤ # buf + n0 ⊦ getbyte(n3, content0) = ((content0.stream to n0) + (content0.stream from n0))[n3]

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 20:
⊦ ⌜m⌝ < # σ0 → (σ0 + σ2)[m] = σ0[m]
Proof step 21:
files1 -- ino = files0 -- ino, files1[ino] = mkfile(m1, md1, # links(ino, dirs), content1), files0[ino] = mkfile(m1, md1, n2, content0), content0.stream from m1 = σ⊥, n3 < m1, afs-cons(dirs, files1), ino ∈ files0, ino ∈ files1, n1 ≤ # buf + n0, n0 ≤ n1 ⊦ getbyte(n3, content0) = ((content0.stream to n0) + (content0.stream from n0))[n3], ⌜n3⌝ < #(content0.stream to n0)

Rule argument

spec: stream, inst: buffer-inf name: get-append-ls seq: ⊦ ⌜m⌝ < # σ0 → (σ0 + σ2)[m] = σ0[m] subst: [m, σ2, σ0] → [n3, content0.stream from n0, content0.stream to n0] flags: <all paths>

Additional information

Used simplifier rules: ⊦ # content.stream = ∞; (s)% ⊦ ¬ ∞ < n∞; (s)%¬ # σ0 < ⌜n⌝ ⊦ #(σ0 to n) = ⌜n⌝ ; (s)% ⊦ ⌜m⌝ < ⌜n⌝ ↔ m < n; (s)%m < n, ¬ # σ0 < ⌜n⌝ ⊦ (σ0 to n)[m] = σ0[m]; (s)% ⊦ content.stream[n] = getbyte(n, content); (s) Used terms: n3, content0.stream from n0, content0.stream to n0