چکیده (انگلیسی):

In this work we study an Hammerstein generalized integral equation
u(t) =∫-∞ ∞ k(t,s) f(s,u(s); u’(s); :::; u(m)(s)) ds; where k : R2 → R is a Wm,∞(R2); m ϵ N; kernel function and f : Rm+2 →R is a L1-C arathéodory function. To the best of our knowledge, this paper is the first one to consider discontinuous nonlinearities with derivatives dependence, without monotone or asymptotic assumptions, on the whole real line. Our method is applied to a fourth order nonlinear boundary value
problem, which models moderately large deflections of infinite nonlinear beams resting on elastic foundations under localized external loads.