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Proof step 6 from proof btree-null (previous step)

((r => mkznode(rp, zbrar, height = 0, false, nused) * bnode(r, zbrar, 0, nused, nused, height, false, ri, iast, as -- adr, alladrs -- adr) * true) )(zh), nsize(nused, nstat), unmodified(adr, mkznode(rp, zbrar, height = 0, false, nused), iast), adr ∈ as, adr ∈ alladrs, adr ∈ iast, as ⊆ alladrs, as ⊆ dom iast ⊦ # as = 0, # alladrs = 0, alladrs = ∅, as = ∅, ((btree(rp, null, adr, height, dirty0, ri, iast, as, alladrs, nstat) * true))(zh1)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 7:
⊦ ((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 8:
((r => mkznode(rp, zbrar, height = 0, false, nused) * bnode(r, zbrar, 0, nused, nused, height, false, ri, iast, as -- adr, alladrs -- adr) * true) )(zh), nsize(nused, nstat), unmodified(adr, mkznode(rp, zbrar, height = 0, false, nused), iast), adr ∈ iast, adr ∈ alladrs, adr ∈ as, as ⊆ dom iast, as ⊆ alladrs ⊦ # alladrs = 0, # as = 0, alladrs = ∅, as = ∅, ∃ r, zh, zbrar, dirty, nused. (null = null ⊃ ¬ dirty ∧ true(zh1);r = null ∧ zh = zh1) ∧ (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) * true) )(zh)

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] → [zh1, true, nstat, alladrs, as, iast, ri, dirty0, height, adr, null, rp] flags: <all paths>

Additional information

Used terms: zh1, true, nstat, alladrs, as, iast, ri, dirty0, height, adr, null, rp