theorem Th45:
  (i ';' j ';' k).1 = IncAddr(j,1)
 proof
  LastLoc(i ';' j) = 2 by Th30;
  hence (i ';' j ';' k).1 = (i ';' j).1 by Th23,Th28
        .= IncAddr(j,1) by Th44;
 end;
