Nielsen number, impulsive differential equations and problem of Jean Leray

Jan Andres

Abstract


We will show that, unlike to usual (i.e.\ non-impulsive) differential equations, the Nielsen theory results for single-valued as well as multivalued maps on tori can be effectively applied to impulsive differential equations and inclusions. With this respect, two main aims will be focused, namely: (i) multiplicity results for harmonic periodic solutions, (ii) the coexistence of subharmonic periodic solutions with various periods. In both cases, we will try to contribute at least partly to the problem posed already in 1950 by Jean Leray. A dynamic complexity of the related maps, measured in terms of entropy, will be also examined.

Keywords


Nielsen number; admissible maps; periodic orbits; impulsive differential equations and inclusions; harmonic and subharmonic solutions; multiplicity results; coexistence of subharmonics; entropy

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References


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