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3. .

(7.1), (7.2) .

(7.7),

X .

:

.

(7.8)

, (7.9), (7.10)

, X

, (7.9), (7.10)

, (7.9), (7.10) .

(7.8)

, ,

(7.7), (7.2) (7.7). , ,

, , (7.7), (7.11), (7.11), (7.7). (7.2),

, , .

,

(7.12) (7.11) .

(7.13) :

(7.14).

:

(7.14) (7.15)

. , (7.16), .

(7.13) , (7.7), (7.2), (7.3)

(7.17) .

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