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Existence and multiplicity of periodic solutions to differential equations with attractive singularities

Published online by Cambridge University Press:  12 April 2021

José Godoy
Affiliation:
Institute of Mathematics, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic ([email protected]; [email protected])
Robert Hakl
Affiliation:
Institute of Mathematics, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic ([email protected]; [email protected])
Xingchen Yu
Affiliation:
School of Mathematics and Statistics, Nanjing University of Information Science and Technology, Nanjing210044, P.R. China ([email protected])

Abstract

The existence and multiplicity of T-periodic solutions to a class of differential equations with attractive singularities at the origin are investigated in the paper. The approach is based on a new method of construction of strict upper and lower functions. The multiplicity results of Ambrosetti–Prodi type are established using a priori estimates and certain properties of topological degree.

Type
Research Article
Copyright
Copyright © The Author(s) 2021. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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