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On the Poincaré problem and Liouvillian integrability of quadratic Liénard differential equations

Published online by Cambridge University Press:  09 January 2020

Maria V. Demina
Affiliation:
National Research University Higher School of Economics, 34 Tallinskaya Street, 123458, Moscow, Russian Federation (maria_dem@mail.ru)
Claudia Valls
Affiliation:
Departamento de Matemática, Instituto Superior Técnico, Universidade de Lisboa, 1049-001Lisboa, Portugal (cvalls@math.tecnico.ulisboa.pt)

Abstract

We present the complete classification of irreducible invariant algebraic curves of quadratic Liénard differential equations. We prove that these equations have irreducible invariant algebraic curves of unbounded degrees, in contrast with what is wrongly claimed in the literature. In addition, we classify all the quadratic Liénard differential equations that admit a Liouvillian first integral.

Type
Research Article
Copyright
Copyright © 2020 The Royal Society of Edinburgh

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