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On a shadowing lemma in metric spaces

Tibor Žáčik (1992)

Mathematica Bohemica

In the present paper conditions are studied, under which a pseudo-orbit of a continuous map f : M M , where M is a metric space, is shadowed, in a more general sense, by an accurate orbit of the map f .

On maximizing measures of homeomorphisms on compact manifolds

Fábio Armando Tal, Salvador Addas-Zanata (2008)

Fundamenta Mathematicae

We prove that given a compact n-dimensional connected Riemannian manifold X and a continuous function g: X → ℝ, there exists a dense subset of the space of homeomorphisms of X such that for all T in this subset, the integral X g d μ , considered as a function on the space of all T-invariant Borel probability measures μ, attains its maximum on a measure supported on a periodic orbit.

On Semicontinuity in Impulsive Dynamical Systems

Krzysztof Ciesielski (2004)

Bulletin of the Polish Academy of Sciences. Mathematics

In the important paper on impulsive systems [K1] several notions are introduced and several properties of these systems are shown. In particular, the function ϕ which describes "the time of reaching impulse points" is considered; this function has many important applications. In [K1] the continuity of this function is investigated. However, contrary to the theorem stated there, the function ϕ need not be continuous under the assumptions given in the theorem. Suitable examples are shown in this paper....

On Stability in Impulsive Dynamical Systems

Krzysztof Ciesielski (2004)

Bulletin of the Polish Academy of Sciences. Mathematics

Several results on stability in impulsive dynamical systems are proved. The first main result gives equivalent conditions for stability of a compact set. In particular, a generalization of Ura's theorem to the case of impulsive systems is shown. The second main theorem says that under some additional assumptions every component of a stable set is stable. Also, several examples indicating possible complicated phenomena in impulsive systems are presented.

On systems governed by two alternating vector fields

Alois Klíč, Jan Řeháček (1994)

Applications of Mathematics

We investigate the nonautonomous periodic system of ODE’s of the form x ˙ = v ( x ) + r p ( t ) ( w ( x ) - v ( x ) ) , where r p ( t ) is a 2 p -periodic function defined by r p ( t ) = 0 for t 0 , p , r p ( t ) = 1 for t ( p , 2 p ) and the vector fields v and w are related by an involutive diffeomorphism.

On the dynamics of ϕ : x x p + a in a local field

David Adam, Youssef Fares (2010)

Actes des rencontres du CIRM

Let K be a local field, a K and ϕ : x x p + a where p denotes the characteristic of the residue field. We prove that the minimal subsets of the dynamical system ( K , ϕ ) are cycles and describe the cycles of this system.

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