. , , , . , . , :
: 1 = 2 1 = 1 1 2 1 = 2 2 1 = 2 . . 1 2 1 = 2 . . 1/2 .. 1/2 .. 1 = 2 . . 1/4 .. p p : 1 = 1 .. p p 2 .. 1 = 1 , , , .