-lemma isrt_inv_max: â\88\80n,c1,c2. ð\9d\90\91ð\9d\90\93â¦\83n,c1 â\88¨ c2â¦\84 →
- â\88\83â\88\83n1,n2. ð\9d\90\91ð\9d\90\93â¦\83n1,c1â¦\84 & ð\9d\90\91ð\9d\90\93â¦\83n2,c2â¦\84 & (n1 ∨ n2) = n.
+lemma isrt_inv_max: â\88\80n,c1,c2. ð\9d\90\91ð\9d\90\93â\9dªn,c1 â\88¨ c2â\9d« →
+ â\88\83â\88\83n1,n2. ð\9d\90\91ð\9d\90\93â\9dªn1,c1â\9d« & ð\9d\90\91ð\9d\90\93â\9dªn2,c2â\9d« & (n1 ∨ n2) = n.