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
  X is epsilon-transitive & X in Tarski-Class W implies X in Rank card
  Tarski-Class W by Th42;
