Three periodic solutions for a nonlinear first order functional differential equation

This paper is concerned with the existence of three positive T-periodic solutions of the first order functional differential equations of the formx^'(t)=a(t)x(t)[email protected](t)f(t,x(h(t))),where a(t),b(t) and @t(t) are positive T-periodic functions, and @l is a positive parameter. Leggett-Williams multiple fixed point theorem has been used to prove our results. Our results extend and improve some results in the literature.

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