| err = err0, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪choose pebs with err = ESUCCESS → mtd-cons(pebs) in pebs0 := pebs⟫ ((err = ESUCCESS → mtd-cons(pebs0)) ∧ (err = ESUCCESS ∨ ⌊err⌋ )) |
err = err0, err = ESUCCESS → mtd-cons(pebs), ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ⟪pebs0 := pebs⟫ ((err = ESUCCESS → mtd-cons(pebs0)) ∧ (err = ESUCCESS ∨ ⌊err⌋ ))
err = err0, ⌊err0⌋ ∨ err0 = ESUCCESS ⊦ ∃ pebs. err = ESUCCESS → mtd-cons(pebs)