, . (, , . 177), . , .
l I ( ), , . , , ,
d x 1 2. , ,
l d x= d S , , B d S= d , . ,
(121.1)
. . , . .
I . , ', . 178 . ( ) ( ) . : A CD.
d A, , A (d A 1) CDA (d A 2), . .
(121.2)
, CDA , , dA 2 > 0.. (121.1), I CDA . CDA d0 , , d2, . ,
(121.3)
, A , , d A 1<0. A d0 , , d1, . ,
(121.4)
(121.3) (121.4) (121.2), :
d2 d1 = d ' , . ,
(121.5)
(121.5), , , . :
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(121.6)
. . , . (121.6) .