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12.

1.

:

, :

. , :

(12.3) (12.4) , ( . , , . , . . , , . . ,

,

(12.6)

, (12.6), (12.7).

(12.6)

(12.6), , (12.6), (12.7)

(12.9), .

,

(12.6).

(12.10),

. e. , (12.10),

, , , (12.6) . , .

, . 7.14, . 7.15.

. 7.14

. 7.15

(12.6) .

. 7.16

, , .

. 7.15 , , . . , , , , . . (. . 7.16). , , . , (12.6), (12.7) (12.9). , , . .

, , , , (12.6), . , : . (12.6), (12.7).

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