| ⊦ r ∈ zh ∧ zh[r] = mkznode(rp0, zbrar0, true, dirty0, nused) ∧ ((btree(rp, r, adr, height, dirty, fi, iast, as, alladrs, nstat) * P))(zh) → height = 0 |
zh[r] = mkznode(rp0, zbrar0, true, dirty0, nused), ((btree(rp, r, adr, height, dirty, fi, iast, as, alladrs, nstat) * P))(zh), r ∈ zh ⊦ height = 0