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A new Chebyshev criterion and its application to planar differential systems

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arxiv 2011.02857 v1 pith:C3T7QIJF submitted 2020-11-05 math.CA

A new Chebyshev criterion and its application to planar differential systems

classification math.CA
keywords differentialchebyshevcriterionplanarsystemsfamiliesannulusanswer
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This paper establishes a new Chebyshev criterion for some family of integrals. By virtue of this criterion we obtain several new Chebyshev families. With the help of these new families we can answer the conjecture posed by Gasull et al in 2015. %[J. Differential Equations, 258 (2015), 3286--3303]. Their applications to other two planar differential systems also show that our approach is simpler and in a unified way to handle many kinds of planar differential systems for estimating the number of limit cycles bifurcating from period annulus.

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