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We present a method for calculating the dynamical degree of a mapping with unconfined singularities. It is based on a method introduced by Halburd for the computation of the growth of the iterates of a rational mapping with confined…

Mathematical Physics · Physics 2017-12-01 Alfred Ramani , Basil Grammaticos , Ralph Willox , Takafumi Mase , Junkichi Satsuma

For any discrete time dynamical system with a rational evolution, we define an entropy, which is a global index of complexity for the evolution map. We analyze its basic properties and its relations to the singularities and the…

chao-dyn · Physics 2009-10-31 M. P. Bellon , C. -M. Viallet

We study nonautonomous mappings of the plane by means of spaces of initial conditions. First we introduce the notion of a space of initial conditions for nonautonomous systems and we study the basic properties of general equations that have…

Mathematical Physics · Physics 2017-02-21 Takafumi Mase

We illustrate the use of the notion of derived recurrences introduced earlier to evaluate the algebraic entropy of self-maps of projective spaces. We in particular give an example, where a complete proof is still awaited, but where…

Dynamical Systems · Mathematics 2024-02-28 C. M. Viallet

The relevance of the algebraic entropy in the study of birational discrete time dynamical systems highlights the need to relate it to other characteristics of these systems. In this letter, two complementary proofs are given that the…

chao-dyn · Physics 2020-11-30 M. P. Bellon

We introduce a series of discrete mappings, which is considered to be an extension of the Hietarinta-Viallet mapping with one parameter. We obtain the algebraic entropy for this mapping by obtaining the recurrence relation for the degrees…

Mathematical Physics · Physics 2018-08-24 Masataka Kanki , Takafumi Mase , Tetsuji Tokihiro

We extend the definition of algebraic entropy to endomorphisms of affine varieties. We calculate algebraic entropy of the action of elements of mapping class groups on various character varieties, and show that it is equal to a quantity we…

Dynamical Systems · Mathematics 2010-05-05 Asaf Hadari

We extend the definition of algebraic entropy to semi-discrete (difference-differential) equations. Calculating the entropy for a number of integrable and non integrable systems, we show that its vanishing is a characteristic feature of…

Exactly Solvable and Integrable Systems · Physics 2015-06-05 D. K. Demskoi , C-M. Viallet

We give the basic definition of algebraic entropy for lattice equations. The entropy is a canonical measure of the complexity of the dynamics they define. Its vanishing is a signal of integrability, and can be used as a powerful…

Mathematical Physics · Physics 2007-05-23 Claude Viallet

We propose an extension of the concept of algebraic entropy, as introduced by Bellon and Viallet for rational maps, to algebraic maps (or correspondences) of a certain kind. The corresponding entropy is an index of the complexity of the…

Chaotic Dynamics · Physics 2016-01-20 A. N. W. Hone , O. Ragnisco , F. Zullo

To study arithmetic structures of natural numbers, we introduce a notion of entropy of arithmetic functions, called anqie entropy. This entropy possesses some crucial properties common to both Shannon's and Kolmogorov's entropies. We show…

Number Theory · Mathematics 2022-07-27 Fei Wei

We consider the ergodic theory of plane rational maps that preserve the natural holomorphic volume form on the algebraic torus. Specifically we construct natural invariant probability measures for a large class of such maps by intersecting…

Dynamical Systems · Mathematics 2025-09-05 Jeffrey Diller , Roland Roeder

We introduce and study a notion of algebraic entropy for self-maps of finite length of Noetherian local rings, and develop its properties. We show that it shares the standard properties of topological entropy. For finite self-maps we…

Algebraic Geometry · Mathematics 2011-09-30 Mahdi Majidi-Zolbanin , Nikita Miasnikov , Lucien Szpiro

In this paper, the concept of L-algebra is revisited and after that, the article is prepared to deal with the notion of the entropy of an L-algebra. If a set has an L-algebraic structure, it is possible to calculate the degree of…

Dynamical Systems · Mathematics 2025-08-26 Mohamad Ebrahimi , Arsham Borumand Saeid

In this paper, we mainly consider on the entropy of the extended map conditional to the natural extension of a dynamical system for an Abelian group action and we calculate the entropy is zero.

Dynamical Systems · Mathematics 2024-03-13 Yuan Lian

We confront two integrability criteria for rational mappings. The first is the singularity confinement based on the requirement that every singularity, spontaneously appearing during the iteration of a mapping, disappear after some steps.…

Exactly Solvable and Integrable Systems · Physics 2007-05-23 S. Lafortune , A. Ramani , B. Grammaticos , Y. Ohta , K. M. Tamizhmani

Various limit-free formulas are given for the computation of the algebraic and the topological entropy, respectively in the settings of endomorphisms of locally finite discrete groups and of continuous endomorphisms of totally disconnected…

Dynamical Systems · Mathematics 2012-05-23 Dikran Dikranjan , Anna Giordano Bruno

This article discusses a method to compute the induced action on the fundamental group of a real rational surface and provides the induced actions for basic quadratic real automorphisms. Using an invariant set in the fundamental group, we…

Dynamical Systems · Mathematics 2021-11-17 Kyounghee Kim , Eric P. Klassen

We introduce and study the notion of a directional complexity and entropy for maps of degree 1 on the circle. For piecewise affine Markov maps we use symbolic dynamics to relate this complexity to the symbolic complexity. We apply a…

Dynamical Systems · Mathematics 2016-09-12 V. Afraimovich , M. Courbage , L. Glebsky

We compute the algebraic entropy of a class of integrable Volterra-like five-point differential-difference equations recently classified using the generalised symmetry method. We show that, when applicable, the results of the algebraic…

Exactly Solvable and Integrable Systems · Physics 2019-07-01 G. Gubbiotti
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