reserve a,b,c,d for Ordinal;
reserve l for non empty limit_ordinal Ordinal;
reserve u for Element of l;
reserve A for non empty Ordinal;
reserve e for Element of A;
reserve X,Y,x,y,z for set;
reserve n,m for Nat;
reserve f for Ordinal-Sequence;
reserve U,W for Universe;
reserve F,phi for normal Ordinal-Sequence of W;
reserve g for Ordinal-Sequence-valued Sequence;
reserve U for uncountable Universe;

theorem Th75:
  1-Veblen(a) is epsilon
  proof set U = Tarski-Class(a\/omega);
    0-Veblen(1-Veblen a) = (succ 0)-Veblen a by Th69;
    hence exp(omega,1-Veblen a) = 1-Veblen a by Th68;
  end;
