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 Th25:
  W is Tarski & A in On W implies card Rank A in card W & Rank A in W
proof
  PQ[B] from ORDINAL2:sch 1(Lm2,Lm3,Lm4);
  hence thesis;
end;
