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4.

(1.7) (1.9). (1.9) . , (1.7)

. . .

(4.1) (4.2) , , . .

, .

, . (4.3) :

. , (1.8) . k = const (1.8)

, , . , .

. .

1. S , . . - ( ).

2. S , . . ( ). , (4.4), S , .

. , , , S, . .

, .

, .

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