- ( ) , . , , . . Ml Mlz z :Ml2 = 2 l (l + 1), Mlz = m ( - , l - , m 2l+1 +l -l 1). , , . () . - , F h , : M0 = Fh (h ). 0 , F, . . 0 = [rF], r - , , F. ' - , ' Q F , ', .