An exact expression of positive periodic solution for a first-order singular equation

An exact expression of positive periodic solution for a first-order singular equation

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Abstract The main purpose of this paper is to obtain an exact expression of the positive periodic solution for a first-order differential equation with Teething Wafers attractive and repulsive singularities.Moreover, we prove the existence of PCBs at least one positive periodic solution for this equation with an indefinite singularity by applications of topological degree theorem, and give the upper and lower bounds of the positive periodic solution.