theorem Th41:
  UsedI*Loc I = UsedI*Loc Reloc(I, k)
proof
A1:  Reloc(I,k) = IncAddr(Shift(I,k),k) by COMPOS_1:34;
  UsedI*Loc Reloc(I, k) = UsedI*Loc Reloc(I,k)
    .= UsedI*Loc Shift (I, k) by Th40,A1
    .= UsedI*Loc I by Th38;
  hence thesis;
end;
