Localization of Nonsmooth Lower and Upper Functions for Periodic Boundary Value Problems
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چکیده
In this paper we present conditions ensuring the existence and localization of lower and upper functions of the periodic boundary value problem u + k u = f(t, u), u(0) = u(2 ), u(0) = u(2 ), k ∈ , k 6= 0. These functions are constructed as solutions of some related generalized linear problems and can be nonsmooth in general.
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تاریخ انتشار 2003