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3.

, . 3.4. , .. Hildebrand [3.0-1, Chap. 3], Jordan [3.0-2, Chap. 11], Milne-Thomson [3.0-3], Norlund [3.0-4].

3.1.

3.1. , ,

,

.

, ,

,

, (3.3) (3.1) ,

. (3.3) ,

3.2. - , , ,

, .

,

,

, (3.6)

(3.4) ,

. (3.6) , I

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