 reserve o,o1,o2 for object;
 reserve n for Ordinal;
 reserve R,L for non degenerated comRing;
 reserve b for bag of 1;

theorem Th38:
   for f be Series of 1,R holds f = (f*(NBag1))*BagN1
   proof
     let f be Series of 1,R;
     (f*(NBag1))*BagN1 = f*(id(Bags 1)) by Th11,RELAT_1:36 .= f by FUNCT_2:17;
     hence thesis;
   end;
