PBVP of volterra integro-differential equations

Abstract
Periodic boundary value problems (PBVP) are studied for the integro-differential equatior x′ = f(t,x(t),Tx),x(O)=x(1), where Tx is the integral term. An existence theorem for such a problem is established without monotonic assumptions on f. This is achieved by considering a Nagumo -like condition on the second variable of f and upper-lower-likely solutions for the problem.

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