const In : set set prop term iIn = In infix iIn 2000 2000 term Subq = \x:set.\y:set.!z:set.z iIn x -> z iIn y term TransSet = \x:set.!y:set.y iIn x -> Subq y x term ordinal = \x:set.TransSet x & !y:set.y iIn x -> TransSet y term nIn = \x:set.\y:set.~ x iIn y const PNoEq_ : set (set prop) (set prop) prop term PNoLt_ = \x:set.\p:set prop.\q:set prop.?y:set.y iIn x & (PNoEq_ y p q & ~ p y & q y) const PNoLe : set (set prop) set (set prop) prop term PNo_upc = \P:set (set prop) prop.\x:set.\p:set prop.?y:set.ordinal y & ?q:set prop.P y q & PNoLe y q x p const PNoLt : set (set prop) set (set prop) prop term PNo_rel_strict_lowerbd = \P:set (set prop) prop.\x:set.\p:set prop.!y:set.y iIn x -> !q:set prop.PNo_upc P y q -> PNoLt x p y q term PNo_strict_lowerbd = \P:set (set prop) prop.\x:set.\p:set prop.!y:set.ordinal y -> !q:set prop.P y q -> PNoLt x p y q const ordsucc : set set lemma !P:set (set prop) prop.!x:set.!y:set.!p:set prop.!z:set.!q:set prop.ordinal x -> y iIn ordsucc x -> PNo_strict_lowerbd P x p -> z iIn y -> PNo_upc P z q -> TransSet x -> ordinal y -> TransSet y -> PNoLt y p z q var P:set (set prop) prop var x:set var y:set var p:set prop var z:set var q:set prop hyp ordinal x hyp y iIn ordsucc x hyp PNo_strict_lowerbd P x p hyp z iIn y hyp PNo_upc P z q hyp TransSet x hyp ordinal (ordsucc x) claim ordinal y -> PNoLt y p z q