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Displaying 141 – 160 of 557

A new algebraic invariant for weak equivalence of sofic subshifts

Laura Chaubard, Alfredo Costa (2008)

RAIRO - Theoretical Informatics and Applications

It is studied how taking the inverse image by a sliding block code affects the syntactic semigroup of a sofic subshift. The main tool are ζ-semigroups, considered as recognition structures for sofic subshifts. A new algebraic invariant is obtained for weak equivalence of sofic subshifts, by determining which classes of sofic subshifts naturally defined by pseudovarieties of finite semigroups are closed under weak equivalence. Among such classes are the classes of almost finite type subshifts...

A new approach to generalized chaos synchronization based on the stability of the error system

Zhi Liang Zhu, Shuping Li, Hai Yu (2008)

Kybernetika

With a chaotic system being divided into linear and nonlinear parts, a new approach is presented to realize generalized chaos synchronization by using feedback control and parameter commutation. Based on a linear transformation, the problem of generalized synchronization (GS) is transformed into the stability problem of the synchronous error system, and an existence condition for GS is derived. Furthermore, the performance of GS can be improved according to the configuration of the GS velocity....

A new approach to the Ricci flow on $S^{2}$

J. Bartz, M. Struwe, R. Ye (1994)

Annali della Scuola Normale Superiore di Pisa - Classe di Scienze

A new chaotic attractor from 2D discrete mapping via border-collision period-doubling scenario.

Elhadj, Zeraoulia (2005)

Discrete Dynamics in Nature and Society

A new curvature invariant and entropy of geodesic flow.

P. Sarnak, R. Osserman (1984)

Inventiones mathematicae

A new degree for $S^{1}$ -invariant gradient mappings and applications

E. N. Dancer (1985)

Annales de l'I.H.P. Analyse non linéaire

A new geometrical framework for time-dependent Hamiltonian mechanics.

Enrico Massa, Stefano Vignolo (2003)

Extracta Mathematicae

A new hierarchy of integrable system of $1 + 2$ dimensions: from Newton's law to generalized Hamiltonian system. II.

Huang, Xuncheng, Tu, Guizhang (2006)

International Journal of Mathematics and Mathematical Sciences

A new LMI-based robust finite-time sliding mode control strategy for a class of uncertain nonlinear systems

Saleh Mobayen, Fairouz Tchier (2015)

Kybernetika

This paper presents a novel sliding mode controller for a class of uncertain nonlinear systems. Based on Lyapunov stability theorem and linear matrix inequality technique, a sufficient condition is derived to guarantee the global asymptotical stability of the error dynamics and a linear sliding surface is existed depending on state errors. A new reaching control law is designed to satisfy the presence of the sliding mode around the linear surface in the finite time, and its parameters are obtained...

A New Mathematical Model of Syphilis

F. A. Milner, R. Zhao (2010)

Mathematical Modelling of Natural Phenomena

The CDC launched the National Plan to Eliminate Syphilis from the USA in October 1999 [4]. In order to reach this goal, a good understanding of the transmission dynamics of the disease is necessary. Based on a SIRS model Breban et al. [3] provided some evidence that supports the feasibility of the plan proving that no recurring outbreaks should occur for syphilis. We study in this work a syphilis model that includes partial...

A new method for measuring the splitting of invariant manifolds

David Sauzin (2001)

Annales scientifiques de l'École Normale Supérieure

A new model for the transport of particles in a thermostatted system.

Benettin, G., Rondoni, L. (2001)

Mathematical Physics Electronic Journal [electronic only]

A new obstruction to embedding Lagrangian tori.

C. Viterbo (1990)

Inventiones mathematicae

A new proof of a conjecture of Yoccoz

Xavier Buff, Arnaud Chéritat (2011)

Annales de l’institut Fourier

We give a new proof of the following conjecture of Yoccoz: $(\exists C \in ℝ) (\forall θ \in ℝ ∖ ℚ) log rad Δ (Q_{θ}) \leq - Y (θ) + C,$ where $Q_{θ} (z) = e^{2 π i θ} z + z^{2}$ , $Δ (Q_{θ})$ is its Siegel disk if $Q_{θ}$ is linearizable (or $\emptyset$ otherwise), $rad Δ (Q_{θ})$ is the conformal radius of the Siegel disk of $Q_{θ}$ (or $0$ if there is none) and $Y (θ)$ is Yoccoz’s Brjuno function.In a former article we obtained a first proof based on the control of parabolic explosion. Here, we present a more elementary proof based on Yoccoz’s initial methods.We then extend this result to some new families of polynomials such as $z^{d} + c$ with $d > 2$ . We also show that...

A new proof of the Aubry-Mather's theorem.

Christopher Golé (1992)

Mathematische Zeitschrift

A new scenario in dissipative systems: sequential extinction of strange attractors

Géza Györgyi (1989)

Banach Center Publications

A non-linear discrete-time dynamical system related to epidemic SISI model

Sobirjon K. Shoyimardonov (2021)

Communications in Mathematics

We consider SISI epidemic model with discrete-time. The crucial point of this model is that an individual can be infected twice. This non-linear evolution operator depends on seven parameters and we assume that the population size under consideration is constant, so death rate is the same with birth rate per unit time. Reducing to quadratic stochastic operator (QSO) we study the dynamical system of the SISI model.

We prove a long standing conjecture of Duval in the special case of sturmian words.

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