科研之友
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摘要
By variational methods, this paper considers 4k-periodic solutions of a kind of differential delay systems with 2k - 1 lags. Our results reveal the fact that the number of 4k periodic orbits depends only upon the eigenvalues of both matrices A and Ao. The conditions are more definite and easier to be examined. Moreover, two examples are given to illustrate the applications of the results.
