Authors: Jaume Llibre
Abstract
This paper is a survey on the study of the maximum number of limit
cycles of planar continuous and discontinuous piecewise linear differential systems
defined in two half–planes separated by a straight line L. We restrict our attention
to the crossing limit cycles, i.e. to the limit cycles having exactly two points on the
straight line L. We summarize the results known by now and describe the tools for
obtaining them.
Departament de Matem` atiques,
Universitat Aut` onoma de Barcelona,
08193 Bellaterra, Barcelona,
Catalonia, Spain
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