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 int_SNo: !x:set.x iIn int -> SNo x lemma !x:set.!y:set.!z:set.!w:set.z iIn omega -> SNo (eps_ z) -> w iIn int -> x = eps_ z * w -> SNo w -> diadic_rational_p y -> diadic_rational_p (x * y) var x:set var y:set var z:set hyp z iIn omega claim SNo (eps_ z) -> (?w:set.w iIn int & x = eps_ z * w) -> diadic_rational_p y -> diadic_rational_p (x * y)