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6.2. ( )

6.2.1. -.

() , () , ,

, (- . . (6.10)

), . (6.10)

(6.12) (6.13)

, ,

(6.10) (6.15) . , (6.15) (6.8) .

6.2.2. .

. . 6.2.1 -. , -

2 , z, (6.16) . -

(6.16)

, .

(6.16) . , - - . (6.12)

.

6.2.3. .

( )

(6.18) , i . , ( . (6.18) . [27].

- (6.18) , -

(6.17) (6.19) , , (6.18),

(6.20) , (., , [25]).

6.2.4. .

, (6.18) n- , (., , [16, 26], . 6.3.5):

- ,

(6.21)

(6.21) .

[. (6.3) (6.4)].

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