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Proof step 7 from proof btree-istore-reduce-refed (previous step)

# zbrar = BRANCH_SIZE, as -- adr = ∅, adr ∈ as ↔ ¬ dirty0, ((r => mkznode(rp, zbrar, true, dirty0, nused) * P))(zh0), nsize(nused, nstat), sorted(zbrar, 0, nused), unmodified(adr, mkznode(rp, zbrar, true, dirty0, nused), iast0), nused ≤ BRANCH_SIZE, as ⊆ ∅ ++ adr, as ⊆ dom iast0, iast0 | as ⊆ iast1, dirty0 → dirty, (rp0 = null ⊃ adr ∈ as ∧ P(zh);r = rp0 ∧ zh0 = zh) ⊦ ((btree(rp, rp0, adr, 0, dirty, payload(zbrar, 0, nused), iast1, as, ∅ ++ adr, nstat) * P))(zh)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 8:
⊦ ((btree(rp, r0, adr, height, dirty0, ri, iast, as, alladrs, nstat) * P))(zh0) ↔ (∃ r, zh, zbrar, dirty, nused. (r0 = null ⊃ ¬ dirty ∧ P(zh0);r = r0 ∧ zh = zh0) ∧ (dirty → dirty0) ∧ (adr ∈ as ↔ ¬ dirty) ∧ adr ∈ alladrs ∧ nsize(nused, nstat) ∧ unmodified(adr, mkznode(rp, zbrar, height = 0, dirty, nused), iast) ∧ (( r => mkznode(rp, zbrar, height = 0, dirty, nused) * bnode(r, zbrar, 0, nused, nused, height, dirty, ri, iast, as -- adr, alladrs -- adr) * P) )(zh))
Proof step 9:
# zbrar = BRANCH_SIZE, as -- adr = ∅, adr ∈ as ↔ ¬ dirty0, ((r => mkznode(rp, zbrar, true, dirty0, nused) * P))(zh0), nsize(nused, nstat), sorted(zbrar, 0, nused), unmodified(adr, mkznode(rp, zbrar, true, dirty0, nused), iast0), nused ≤ BRANCH_SIZE, iast0 | as ⊆ iast1, as ⊆ dom iast0, as ⊆ ∅ ++ adr, dirty0 → dirty, (rp0 = null ⊃ adr ∈ as ∧ P(zh);r = rp0 ∧ zh0 = zh) ⊦ ∃ r, zh1, zbrar0, dirty1, nused0. (rp0 = null ⊃ ¬ dirty1 ∧ P(zh);r = rp0 ∧ zh1 = zh) ∧ (dirty1 → dirty) ∧ (adr ∈ as ↔ ¬ dirty1) ∧ adr ∈ ∅ ++ adr ∧ nsize(nused0, nstat) ∧ unmodified(adr, mkznode(rp, zbrar0, 0 = 0, dirty1, nused0), iast1) ∧ (( r => mkznode(rp, zbrar0, 0 = 0, dirty1, nused0) * bnode(r, zbrar0, 0, nused0, nused0, 0, dirty1, payload(zbrar, 0, nused), iast1, as -- adr, (∅ ++ adr) -- adr) * P) )(zh1)

Rule argument

spec: <toplevel> name: btree seq: ⊦ (( btree (rp, r0, adr, height, dirty0, ri, iast, as, alladrs, nstat) * P) )(zh0) ↔ (∃ r, zh, zbrar, dirty, nused. (r0 = null ⊃ ¬ dirty ∧ P(zh0);r = r0 ∧ zh = zh0) ∧ (dirty → dirty0) ∧ (adr ∈ as ↔ ¬ dirty) ∧ adr ∈ alladrs ∧ nsize(nused, nstat) ∧ unmodified (adr, mkznode(rp, zbrar, height = 0, dirty, nused), iast) ∧ (( r => mkznode(rp, zbrar, height = 0, dirty, nused) * bnode (r, zbrar, 0, nused, nused, height, dirty, ri, iast, as -- adr, alladrs -- adr) * P) )(zh)) subst: [zh0, P, nstat, alladrs, as, iast, ri, dirty0, height, adr, r0, rp] → [zh, P, nstat, ∅ ++ adr, as, iast1, payload(zbrar, 0, nused), dirty, 0, adr, rp0, rp] flags: <all paths>

Additional information

Used terms: zh, P, nstat, ∅ ++ adr, as, iast1, payload(zbrar, 0, nused), dirty, 0, adr, rp0, rp