reserve n,m for Nat,
  r,r1,r2,s,t for Real,
  x,y for set;

theorem Th68:
  for D be non empty set, F be PartFunc of D,REAL holds FinS(F,{}) = <*>REAL
proof
  let D be non empty set, F be PartFunc of D,REAL;
  dom(F|{}) = dom F /\ {} by RELAT_1:61
    .= {};
  then len FinS(F,{}) = 0 by Th67,CARD_1:27;
  hence thesis;
end;
