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- Stability and Bifurcations Analysis of Discrete Dynamical Systems
- Dynamical systems theory
- Dynamical Systems, Theory and Applications
Dynamical systems theory is an area of mathematics used to describe the behavior of complex dynamical systems , usually by employing differential equations or difference equations. When differential equations are employed, the theory is called continuous dynamical systems.
Items in Shodhganga are protected by copyright, with all rights reserved, unless otherwise indicated. Shodhganga Mirror Site. Show full item record. Borkar V C. This study of the dynamics of some ecosystem models as newlineapplication to the discrete dynamical systems consists of two parts, newlinethe first part focuses on bifurcation analysis and stability of the newlineecosystem models with two dimensional systems.
Stability and Bifurcations Analysis of Discrete Dynamical Systems
Dynamical systems theory is an area of mathematics used to describe the behavior of complex dynamical systems , usually by employing differential equations or difference equations.
When differential equations are employed, the theory is called continuous dynamical systems. From a physical point of view, continuous dynamical systems is a generalization of classical mechanics , a generalization where the equations of motion are postulated directly and are not constrained to be Euler—Lagrange equations of a least action principle. When difference equations are employed, the theory is called discrete dynamical systems.
When the time variable runs over a set that is discrete over some intervals and continuous over other intervals or is any arbitrary time-set such as a Cantor set , one gets dynamic equations on time scales. Some situations may also be modeled by mixed operators, such as differential-difference equations. This theory deals with the long-term qualitative behavior of dynamical systems, and studies the nature of, and when possible the solutions of, the equations of motion of systems that are often primarily mechanical or otherwise physical in nature, such as planetary orbits and the behaviour of electronic circuits , as well as systems that arise in biology , economics , and elsewhere.
Much of modern research is focused on the study of chaotic systems. This field of study is also called just dynamical systems , mathematical dynamical systems theory or the mathematical theory of dynamical systems. Dynamical systems theory and chaos theory deal with the long-term qualitative behavior of dynamical systems.
Here, the focus is not on finding precise solutions to the equations defining the dynamical system which is often hopeless , but rather to answer questions like "Will the system settle down to a steady state in the long term, and if so, what are the possible steady states?
An important goal is to describe the fixed points, or steady states of a given dynamical system; these are values of the variable that don't change over time. Some of these fixed points are attractive , meaning that if the system starts out in a nearby state, it converges towards the fixed point. Similarly, one is interested in periodic points , states of the system that repeat after several timesteps. Periodic points can also be attractive. Sharkovskii's theorem is an interesting statement about the number of periodic points of a one-dimensional discrete dynamical system.
Even simple nonlinear dynamical systems often exhibit seemingly random behavior that has been called chaos. The concept of dynamical systems theory has its origins in Newtonian mechanics. There, as in other natural sciences and engineering disciplines, the evolution rule of dynamical systems is given implicitly by a relation that gives the state of the system only a short time into the future.
Before the advent of fast computing machines , solving a dynamical system required sophisticated mathematical techniques and could only be accomplished for a small class of dynamical systems. The dynamical system concept is a mathematical formalization for any fixed "rule" that describes the time dependence of a point's position in its ambient space. Examples include the mathematical models that describe the swinging of a clock pendulum, the flow of water in a pipe, and the number of fish each spring in a lake.
A dynamical system has a state determined by a collection of real numbers , or more generally by a set of points in an appropriate state space. Small changes in the state of the system correspond to small changes in the numbers. The numbers are also the coordinates of a geometrical space—a manifold. The evolution rule of the dynamical system is a fixed rule that describes what future states follow from the current state.
The rule may be deterministic for a given time interval one future state can be precisely predicted given the current state or stochastic the evolution of the state can only be predicted with a certain probability. Dynamicism , also termed the dynamic hypothesis or the dynamic hypothesis in cognitive science or dynamic cognition , is a new approach in cognitive science exemplified by the work of philosopher Tim van Gelder. It argues that differential equations are more suited to modelling cognition than more traditional computer models.
In mathematics , a nonlinear system is a system that is not linear —i. Less technically, a nonlinear system is any problem where the variable s to solve for cannot be written as a linear sum of independent components. A nonhomogeneous system, which is linear apart from the presence of a function of the independent variables , is nonlinear according to a strict definition, but such systems are usually studied alongside linear systems, because they can be transformed to a linear system as long as a particular solution is known.
In sports biomechanics , dynamical systems theory has emerged in the movement sciences as a viable framework for modeling athletic performance and efficiency. From a dynamical systems perspective, the human movement system is a highly intricate network of co-dependent sub-systems e. In dynamical systems theory, movement patterns emerge through generic processes of self-organization found in physical and biological systems.
Dynamical system theory has been applied in the field of neuroscience and cognitive development , especially in the neo-Piagetian theories of cognitive development. It is the belief that cognitive development is best represented by physical theories rather than theories based on syntax and AI.
It also believed that differential equations are the most appropriate tool for modeling human behavior. These equations are interpreted to represent an agent's cognitive trajectory through state space. In other words, dynamicists argue that psychology should be or is the description via differential equations of the cognitions and behaviors of an agent under certain environmental and internal pressures.
The language of chaos theory is also frequently adopted. In it, the learner's mind reaches a state of disequilibrium where old patterns have broken down.
This is the phase transition of cognitive development. Self-organization the spontaneous creation of coherent forms sets in as activity levels link to each other. Newly formed macroscopic and microscopic structures support each other, speeding up the process. These links form the structure of a new state of order in the mind through a process called scalloping the repeated building up and collapsing of complex performance.
This new, novel state is progressive, discrete, idiosyncratic and unpredictable. Dynamic systems theory has recently been used to explain a long-unanswered problem in child development referred to as the A-not-B error. The application of Dynamic Systems Theory to study second language acquisition is attributed to Diane Larsen-Freeman who published an article in in which she claimed that second language acquisition should be viewed as a developmental process which includes language attrition as well as language acquisition.
From Wikipedia, the free encyclopedia. Main article: Dynamical system definition. Main article: Nonlinear system. Main article: Dynamic approach to second language development. List of dynamical system topics Baker's map Biological applications of bifurcation theory Dynamical system definition Embodied Embedded Cognition Fibonacci numbers Fractals Gingerbreadman map Halo orbit List of types of systems theory Oscillation Postcognitivism Recurrent neural network Combinatorics and dynamical systems Synergetics Systemography.
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Dynamical systems theory
It seems that you're in Germany. We have a dedicated site for Germany. Chaos Theory is a synonym for dynamical systems theory, a branch of mathematics. Dynamical systems come in three flavors: flows continuous dynamical systems , cascades discrete, reversible, dynamical systems , and semi-cascades discrete, irreversible, dynamical systems. Flows and semi-cascades are the classical systems iuntroduced by Poincare a centry ago, and are the subject of the extensively illustrated book: "Dynamics: The Geometry of Behavior," Addison-Wesley authored by Ralph Abraham and Shaw.
Dynamical Systems, Theory and Applications
Khan, Tarek F. The importance of difference equations cannot be overemphasized. These equations model discrete physical phenomena on one hand and are integral part of numerical schemes used to solve differential equations, on the other hand. This widens the applicability of such equations to many branches of scientific knowledge.
Difference equations in economics 2. Scalar linear difference equations 3. One-dimensional dynamical economic systems 4. Time-dependent solutions of scalar systems 5. Economic bifurcations and chaos 6.
Discrete & Continuous Dynamical Systems - A
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- Но как только я узнаю, что вы следите за мной, я немедленно расскажу всю эту историю журналистам. Я расскажу, что Цифровая крепость - это большая липа, и отправлю на дно все ваше мерзкое ведомство. Стратмор мысленно взвешивал это предложение. Оно было простым и ясным. Сьюзан остается в живых, Цифровая крепость обретает черный ход. Если не преследовать Хейла, черный ход останется секретом. Но Стратмор понимал, что Хейл не станет долго держать язык за зубами.
19: ОШИБКА В СИСТЕМНОМ РАЗДЕЛЕ 20: СКАЧОК НАПРЯЖЕНИЯ 21: СБОЙ СИСТЕМЫ ХРАНЕНИЯ ДАННЫХ Наконец она дошла до пункта 22 и, замерев, долго всматривалась в написанное. Потом, озадаченная, снова взглянула на монитор. КОД ОШИБКИ 22 Сьюзан нахмурилась и снова посмотрела в справочник. То, что она увидела, казалось лишенным всякого смысла. 22: РУЧНОЕ ОТКЛЮЧЕНИЕ ГЛАВА 35 Беккер в шоке смотрел на Росио. - Вы продали кольцо. Девушка кивнула, и рыжие шелковистые волосы скользнули по ее плечам.
Меган? - позвал. Ответа не последовало. - Меган. Беккер подошел и громко постучал в дверцу. Тишина.
В ней говорилось о том, к чему она совершенно не была готова. Последние слова записки стали для нее сильнейшим ударом. И в первую очередь я сожалею о Дэвиде Беккере.
Соблазнительный образ Кармен тут же улетучился. Код ценой в один миллиард долларов. Некоторое время он сидел словно парализованный, затем в панике выбежал в коридор. - Мидж. Скорее .
Никто не знает, как поведет себя общество, узнав, что группы фундаменталистов дважды за прошлый год угрожали ядерным объектам, расположенным на территории США. Ядерное нападение было, однако, не единственной угрозой.