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:

. 2 3. [73] .

:

(5.2.2)

, , , (. . 3). , , , .

, . 5.2 5.3. . 5.2 (. . 2). , (. . 5.3). , . (. . 2 4).

(5.2.2) . 5.3.

. 5.2. , [137]. .: New Approaches Nonlinear Problems in Dynamics, ed. by P. S. Holmes, 1980 by SIAM.)

. 5.3. , [ (3.2.2)]. (. 5.3.).

, . [209] (. . 5.4). , b . , , .

, [73], . , , , , . ( ) , , .

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