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Proof step 52 from proof btree-write-node (previous step)

⊦ iast0 ⊆ iast1 ∧ ((btree(rp, r0, adr, height, dirty0, ri, iast0, as, alladrs, nstat) * P))(zh0) → ((btree(rp, r0, adr, height, dirty0, ri, iast1, as, alladrs, nstat) * P))(zh0)

Proof step 52 from proof btree-write-node (previous step)

Lemma btree-istore-reduce