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Proof step 3 from proof initialization (previous step)

maxino = LEB_SIZE ⊦ ⟪btree_format#(maxino0, maxino, maxino1; adr, adr0, istore, istore0, ginval, gstore, gstore0, nx, maxino2, ginval0, pstate, syn; rp, err)⟫ ( ( err = ESUCCESS → syn ∧ (∃ ri, fi. btree-inv(rp, adr0, istore, istore0, zh, ri, fi)) ∧ inv-journal(nx, gstore, gstore0, ginval) ∧ inv-index(istore, istore0) ∧ inv-state(pstate, nx, gstore, istore, syn)) ∧ (err = ESUCCESS ∨ ⌊err⌋ ) ∧ (err = ESUCCESS → btree-inv(rp, adr0, istore, istore0, zh, ∅, ∅) ∧ gstore = ∅ ∧ ginval = ∅ ∧ maxino2 = maxino1 ∧ nx = [] ∧ ginval0 = ∅))

A spec-lemma