.
F0 0, , f0 0 =4-5:
(2.56)
.
()
() , , :
-------------------------------------------------------------------------------------------------------* 3.
-------------------------------------------------------------------------------------------------------
(2.57)
F - , 2;
- ;
f - , , 2.
. , . , f0$, .
, , , , .
, f0 . . 15-20 2
, , , , .
, , , ( , ..). , f, FCK:
(2.58)