> > .
<<
>>
<< >>

3. .

. 3 2 , , ,

, (5.12) ,

. .

, . . t , (5.12), . .

(5.13) (5.19),

(5.20) (5.19),

(5.12).

(5.12) .

. , (5.12): . .

, , ,

(5.21) .

<< >>