### Book chapter

## Dynamical generation of parameter laminations

### In book

Through the use of methods of synergetics - an interdisciplinary approach in modern science that investigates common features of complex systems of various origins - the monograph analyzes complex phenomena in economics. The author shows that modern economies are characterized by multiple synergetic features, with studies of economic time series providing the grounds for assuming an important role of synergetic effects in actual trajectories of economic development. Significant attention is dedicated in the book to uncovering the basic principles of a synergetic approach to modern economics, and to the demonstration of the key concepts of synergetics, as applied to economics.

The monograph has been written for an economic readership in the first place, although experts from other fields of knowledge can also find it interesting. Some of the hypotheses and conclusions suggested in the book can also pose interest for government officials.

We interpret the combinatorial Mandelbrot set in terms of \it{quadratic laminations} (equivalence relations ∼ on the unit circle invariant under σ2). To each lamination we associate a particular {\em geolamination} (the collection ∼ of points of the circle and edges of convex hulls of ∼-equivalence classes) so that the closure of the set of all of them is a compact metric space with the Hausdorff metric. Two such geolaminations are said to be {\em minor equivalent} if their {\em minors} (images of their longest chords) intersect. We show that the corresponding quotient space of this topological space is homeomorphic to the boundary of the combinatorial Mandelbrot set. To each equivalence class of these geolaminations we associate a unique lamination and its topological polynomial so that this interpretation can be viewed as a way to endow the space of all quadratic topological polynomials with a suitable topology.

Through the use of methods of synergetics - an interdisciplinary approach in modern science that investigates common features of complex systems of various origins - the monograph analyzes complex phenomena in economics. The author shows that modern economies are characterized by multiple synergetic features, with studies of economic time series providing the grounds for assuming an important role of synergetic effects in actual trajectories of economic development. Significant attention is dedicated in the book to uncovering the basic principles of a synergetic approach to modern economics, and to the demonstration of the key concepts of synergetics, as applied to economics.

The monograph has been written for an economic readership in the first place, although experts from other fields of knowledge can also find it interesting. Some of the hypotheses and conclusions suggested in the book can also pose interest for government officials.

A small perturbation of a quadratic polynomial f with a non-repelling fixed point gives a polynomial g with an attracting fixed point and a Jordan curve Julia set, on which g acts like angle doubling. However, there are cubic polynomials with a nonrepelling fixed point, for which no perturbation results into a polynomial with Jordan curve Julia set. Motivated by the study of the closure of the Cubic Principal Hyperbolic Domain, we describe such polynomials in terms of their quadratic-like restrictions.

The connectedness locus in the parameter space of quadratic polynomials is called the Mandelbrot set. A good combinatorial model of this set is due to Thurston. By definition, the principal hyperbolic domain of the Mandelbrot set consists of parameter values, for which the corresponding quadratic polynomials have an attracting fixed point. The closure of the principal hyperbolic domain of the Mandelbrot set is called the main cardioid. Its topology is completely described by Thurston's model. Less is known about the connectedness locus in the parameter space of cubic polynomials. In this paper, we discuss cubic analogues of the main cardioid and establish relationships between them.

The paper deals with Newton maps of complex exponential functions and a surgery tool developed by P. Haissinsky. The concept of "Postcritically minimal" Newton maps of complex exponential functions are introduced, analogous to postcritically finite Newton maps of polynomials. The dynamics preserving mapping is constructed between the space of postcritically finite Newton maps of polynomials and the space of postcritically minimal Newton maps of complex exponential functions.