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