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A class of spherically symmetric solutions with conformal killing vectors

โœ Scribed by C. C. Dyer; G. C. McVittie; L. M. Oattes


Publisher
Springer US
Year
1987
Tongue
English
Weight
422 KB
Volume
19
Category
Article
ISSN
0001-7701

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โœ Ke Wu; Xian Wu ๐Ÿ“‚ Article ๐Ÿ“… 2010 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 326 KB

By the weak linking theorem and the local linking theorem, we study the existence of periodic solutions for the following delay non-autonomous systems The variational principle is given, some existence theorems of 4r-periodic solutions of (1) are obtained.