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2.

. . , k :

(2.1)

(2.2)

(1.2). m (2.3). (2.1),

(2.2) (2.4)

z.

(2.6)

(2.6) .

(2.2) (2.6) , . . . v (2.2) (2.6), , .

. .

, .

(1.3). (2.3) , :

.

(1.5) , ,

(2.7) (2.9), (1.3)

, ,

(2.2), (2.6) , . . v , (2.11) . (2.11) , . , . .

, . . , (2.11)

k , . . ,

, (2.2), (2.6), (2.11)

(2.8). (2.12) : .

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