On The Existence Of Periodic Solutions Of Certain Fourth Order Differential Equations with Dealy
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We derive existence results for the
periodic boundary value problem
.r'" ' + uf.· + f (.); ).\: + ex + g (f. r(..r - r) = p ( l )
\ ( OJ = x(2rrl .. ~ (0) = .\· (2 17' ) . . \' Ol = x! '21r ).
:\'' (0) i ' : \ ' (2 7r)
using degree theoretic methods. The uniqueness of
periodic solutions is also examined
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QA Mathematics