householder ??? ??? ????? ??????? ??? ?? ??????? ????? ??????? ??????? ??? ????? ???? ??? ?? ????? ????? ?? ????. ??? ??????? ???? ?? ??? ?? ?????? ?? ????? ??????? ??????? ???? ??????? . ????? ??? ??? ???????? \ ????? ???? ???????? ?? ????? ????? ????? ????? ?????? ?? ????? ????? ??????? ? ????? ??? ?? ?????? ?????? ????????