theorem Th44:
 (i ';' j).1 = IncAddr(j,1)
proof
  0 in dom Macro j by COMPOS_1:57;
  then
A1: (Macro j)/.0 = (Macro j).0 by PARTFUN1:def 6
   .= j by COMPOS_1:58;
A2: LastLoc Macro j = 1 by Th29;
 thus (i ';' j).1 = (i ';' Macro j).(LastLoc Macro i + 0) by Th29
     .= IncAddr((Macro j)/.0,LastLoc Macro i) by A2,Th43
     .= IncAddr(j,1) by A1,Th29;
end;
