Multiple Positive Periodic Solutions for Second-Order Differential Equations with a Singularity

In this paper, we obtain the existence of multiple positive periodic solutions for second-order differential equations with a singularity of the form x ″ ( t ) + f ( t , x ( t ) ) x ′ ( t ) + g ( x ( t ) ) = p ( t ) = p ( t + T ) by means of the continuation theorem of coincidence degree theory. Thi...

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