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 Antennas first-order differential equation with attractive and repulsive singularities.Moreover, we prove the existence of at least one positive periodic solution for this equation with an indefinite singularity by applications of Audio Tube topological degree theorem, and give the upper and lower bounds of the positive periodic solution.