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 const ordsucc : set set const Empty : set const real : set axiom real_1: ordsucc Empty iIn real const complex : set axiom real_complex: Subq real complex claim ordsucc Empty iIn complex