reserve m for Cardinal,
  A,B,C for Ordinal,
  x,y,z,X,Y,Z,W for set,
  f for Function;
reserve f,g for Function,
  L for Sequence,
  F for Cardinal-Function;

theorem
  A in On Tarski-Class W implies card Rank A c= card Tarski-Class W
proof
  assume A in On Tarski-Class W;
  then card Rank A in card Tarski-Class W by Th25;
  hence thesis by CARD_1:3;
end;
