
theorem LemmaFuncs:
  the set of all f where f is Fuzzy_Negation c= Funcs ([.0,1.],[.0,1.])
  proof
    let x be object;
    assume x in the set of all f where f is Fuzzy_Negation; then
    consider f being Fuzzy_Negation such that
A1: x = f;
    thus thesis by A1,FUNCT_2:8;
  end;
