Periodic Solutions of Second-Order Differential Equations in Hilbert Spaces
Keyword(s):
AbstractWe prove the existence of periodic solutions of some infinite-dimensional systems by the use of the lower/upper solutions method. Both the well-ordered and non-well-ordered cases are treated, thus generalizing to systems some well-established results for scalar equations.
1993 ◽
Vol 119
(2)
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pp. 439-439
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2005 ◽
Vol 308
(2)
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pp. 393-419
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2006 ◽
Vol 317
(1)
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pp. 1-13
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1988 ◽
Vol 103
(3)
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pp. 765-765
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1981 ◽
pp. 287-294
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