Jaume Llibre, Ana Cristina Mereu
Abstract:
We divide
into sectors
,
with
even,
and define a discontinuous differential system such that in each sector,
we have a smooth generalized Lienard polynomial differential equation
,
alternatively, where
and
are polynomials of degree n-1 and m respectively.
Then we apply the averaging theory for first-order discontinuous differential
systems to show that for any
and
there are non-smooth Lienard polynomial
equations having at least max{n,m} limit cycles.
Note that this number is independent of the number of sectors.
Submitted May 7, 2013. Published September 3, 2013.
Math Subject Classifications: 34C29, 34C25, 47H11.
Key Words: Limit cycles; non-smooth Lienard systems; averaging theory.
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Jaume Llibre Departament de Matematiques Universitat Autonoma de Barcelona 08193 Bellaterra, Barcelona, Catalonia, Spain email: jllibre@mat.uab.cat | |
Ana Cristina Mereu Department of Physics, Chemistry and Mathematics UFSCar 18052-780, Sorocaba, SP, Brazil email: anamereu@ufscar.br |
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