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15.2.

15.2.1. .

- , (.

. , .

. 13.9.3, . , (.

, , , , , .

15.2.2. .

[. (13.124)]

(15.51)

x ( )

(15.51 )

(15.51 )

V (15.516)

(5.51 )

( ) ,

(15.52)

(15.51)

(15.53)

,

(15.54)

(15.55)

(. . 13.9.2) ! (15.53)

(15.56)

(15.52).

:

(15.576)

(15.55) [. (15.56)].

15.2.3. .

N , (. . 15.1.7)

(15.58)

(15.596)

(15.38).

(15.58)

(15.60 )

(15.61) ), t 0 (15.38),

(15.62)

(15.61), (15.58)

(15.63)

(15.606) , . .

(15.64)

(15.65)

[. (15.59 ), (15.59 ), (15.62)]

(15.52).

(15.64) (15.65) , (15.63)

(15.56).

(15.64) , (15.63)

15.2.4. .

. 15.2.3 - .

( )

(15.66)

(0, )

(15.67)

(15.68)

( ),

(15.69)

( ), .

,

(15.70)

(15.71 )

, ,

(15.72)

, , , (15.58)

(15.73)

(15.74)

(15.75 )

1

(15.76)

(15.77)

(15.77) (15.62)

(15.78)

(15.74)

(15.79 )

(15.74) :

(15.80)

(15.79 ) , . .

(15.81)

(15.82)

, (15.78)

(15.83)

(15.83) :

(15.846)

(15.81) (15.80)

(15.85)

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