reserve Q,Q1,Q2 for multLoop;
reserve x,y,z,w,u,v for Element of Q;

theorem Th50:
  1.Q in [#] (lp (Cent Q)) & 1.Q in Cent Q
proof
  the OneF of (lp (Cent Q)) = 1.Q by Def30;
  then 1.Q in [#] (lp (Cent Q));
  hence thesis by Th25;
end;
