const In : set set prop term iIn = In infix iIn 2000 2000 const omega : set const int : set const mul_SNo : set set set term * = mul_SNo infix * 2291 2290 const eps_ : set set term diadic_rational_p = \x:set.?y:set.y iIn omega & ?z:set.z iIn int & x = eps_ y * z const SNo : set prop axiom SNo_eps_: !x:set.x iIn omega -> SNo (eps_ x) const minus_SNo : set set term - = minus_SNo lemma !x:set.!y:set.y iIn omega -> SNo (eps_ y) -> (?z:set.z iIn int & x = eps_ y * z) -> diadic_rational_p - x claim !x:set.diadic_rational_p x -> diadic_rational_p - x