Effective medium approximations: Difference between revisions

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The filled-in Julia set <math>\ K(f) </math> of a polynomial <math>\ f  </math> is :
* a [[Julia set]] and its [[Interior (topology)|interior]],
* [[escaping set|non-escaping set]]
 
==Formal definition==
 
The filled-in [[Julia set]] <math>\ K(f) </math> of a polynomial <math>\ f  </math> is defined as the set of all points <math>z\,</math> of the dynamical plane that have [[Bounded sequence|bounded]] [[Orbit (dynamics)|orbit]] with respect to <math>\ f  </math>
 
<math> \ K(f) \  \overset{\underset{\mathrm{def}}{}}{=} \  \{ z \in  \mathbb{C}  : f^{(k)} (z)  \not\to  \infty\  as\  k \to \infty \} </math>
<br>
where :
 
<math>\mathbb{C}</math> is the [[Complex number|set of complex numbers]]
 
<math> \ f^{(k)} (z) </math> is the <math>\ k</math> -fold [[Function composition|composition]] of <math>f \,</math> with itself = [[Iterated function|iteration of function]] <math>f \,</math>
 
==Relation to the Fatou set==
The filled-in Julia set is the [[Complement (set theory)|(absolute) complement]] of the [[Basin of attraction|attractive basin]] of [[Point at infinity|infinity]]. <br />
<math>K(f) = \mathbb{C} \setminus A_{f}(\infty)</math>
 
The [[Basin of attraction|attractive basin]] of [[Point at infinity|infinity]] is one of the [[Classification of Fatou components|components of the Fatou set]].<br />
<math>A_{f}(\infty) = F_\infty </math>
 
In other words, the filled-in Julia set is the [[Complement (set theory)|complement]] of the unbounded [[Classification of Fatou components|Fatou component]]: <br />
<math>K(f) = F_\infty^C.</math>
 
==Relation between Julia, filled-in Julia set and attractive basin of infinity==
{{Wikibooks|Fractals }}
 
The [[Julia set]] is the common [[Boundary (topology)|boundary]] of the filled-in Julia set and the [[Basin of attraction|attractive basin]] of [[Point at infinity|infinity]] <br>
<br />
<math>J(f)\, = \partial K(f) =\partial  A_{f}(\infty)</math><br />
<br />
where : <br />
<math>A_{f}(\infty)</math> denotes the [[Basin of attraction|attractive basin]] of [[Point at infinity|infinity]]  = exterior of filled-in Julia set = set of escaping points for  <math>f</math><br />
<br />
<math>A_{f}(\infty) \  \overset{\underset{\mathrm{def}}{}}{=} \  \{ z \in  \mathbb{C}  : f^{(k)} (z)  \to  \infty\  as\  k \to \infty \}. </math>
 
If the filled-in Julia set has no [[Interior (topology)|interior]] then the [[Julia set]] coincides with the filled-in Julia set. This happens when all the critical points of <math>f</math> are pre-periodic.  Such critical points are often called [[Misiurewicz point]]s.
 
==Spine ==
 
The most studied polynomials are probably those of the form <math>f(z)=z^2 + c</math>, which are often denoted by <math>f_c</math>, where <math>c</math> is any complex number.  In this case, the spine <math>S_c\,</math> of the filled Julia set <math>\ K \,</math> is defined as [[Arc (projective geometry)|arc]]  between <math>\beta\,</math>[[Periodic points of complex quadratic mappings|-fixed point]] and <!-- its preimage --> <math>-\beta\,</math>,
 
<math>S_c = \left [ - \beta , \beta  \right ]\,</math>
 
with such properties:
*spine lies inside <math>\ K \,</math>.<ref>[http://www.math.rochester.edu/u/faculty/doug/oldcourses/215s98/lecture10.html Douglas C. Ravenel : External angles in the Mandelbrot set: the work of Douady and Hubbard. University of Rochester]</ref> This makes sense when <math>K\,</math> is connected and full <ref>[http://www.emis.de/journals/EM/expmath/volumes/13/13.1/Milnor.pdf  John Milnor : Pasting Together Julia Sets: A Worked Out Example of Mating. Experimental Mathematics Volume 13 (2004)]</ref>
* spine is invariant under 180 degree rotation,
* spine is a finite topological tree,
*[[Complex quadratic polynomial|Critical point]] <math> z_{cr} = 0  \,</math> always belongs to the spine.<ref>[http://arxiv.org/abs/math/9801148 Saaed Zakeri: Biaccessiblility in quadratic Julia sets I: The locally-connected case]</ref>
*<math>\beta\,</math>[[Periodic points of complex quadratic mappings|-fixed point]] is a landing point of [[external ray]]  of angle zero <math>\mathcal{R}^K  _0</math>,
*<math>-\beta\,</math> is landing point of [[external ray]]  <math>\mathcal{R}^K  _{1/2}</math>.
 
Algorithms for constructing the spine:
*[[b:Fractals/Iterations in the complex plane/Julia set|detailed version]] is described by A. Douady<ref>A. Douady, “Algorithms for computing angles in the Mandelbrot set,” in Chaotic Dynamics and Fractals, M. Barnsley and S. G. Demko, Eds., vol. 2 of Notes and Reports in Mathematics in Science and Engineering, pp. 155–168, Academic Press, Atlanta, Georgia, USA, 1986.</ref>
 
*Simplified version of algorithm:
**connect <math>- \beta\,</math> and <math> \beta\,</math> within <math>K\,</math> by an arc,
**when <math>K\,</math> has empty interior then arc is unique,
**otherwise take the shortest way that contains <math>0</math>.<ref>[http://www.cambridge.org/catalogue/catalogue.asp?isbn=9780521547666 K M. Brucks, H Bruin : Topics from One-Dimensional Dynamics Series: London Mathematical Society Student Texts (No. 62) page 257]</ref>
 
Curve <math>R\,</math> :
 
<math>R\  \overset{\underset{\mathrm{def}}{}}{=} \  R_{1/2}\ \cup\  S_c\  \cup \ R_0 \,</math>
 
divides dynamical plane into two components.
 
==Images==
<gallery>
Image:Time escape Julia set from coordinate (phi-2, 0).jpg|Filled Julia set for f<sub>c</sub>, c=φ&minus;2=-0.38..., where φ means [[Golden ratio]]
Image:Julia_IIM_1.jpg| Filled Julia with no interior = Julia set. It is for c=i.
Image:Filled.jpg| Filled Julia set for c=-1+0.1*i. Here Julia set is the boundary of filled-in Julia set.
Image:ColorDouadyRabbit1.jpg|[[Douady rabbit]]
</gallery>
 
==Notes==
{{Reflist}}
 
==References==
# Peitgen Heinz-Otto, Richter, P.H. : The beauty of fractals: Images of Complex Dynamical Systems. Springer-Verlag 1986. ISBN 978-0-387-15851-8.
# Bodil Branner : Holomorphic dynamical systems in the complex plane. Department of Mathematics Technical University of Denmark, [http://www2.mat.dtu.dk/publications/uk?id=122 MAT-Report no. 1996-42].
 
{{DEFAULTSORT:Filled Julia Set}}
[[Category:Fractals]]
[[Category:Limit sets]]
[[Category:Complex dynamics]]

Revision as of 21:07, 17 January 2014

The filled-in Julia set of a polynomial is :

Formal definition

The filled-in Julia set of a polynomial is defined as the set of all points of the dynamical plane that have bounded orbit with respect to


where :

is the set of complex numbers

is the -fold composition of with itself = iteration of function

Relation to the Fatou set

The filled-in Julia set is the (absolute) complement of the attractive basin of infinity.

The attractive basin of infinity is one of the components of the Fatou set.

In other words, the filled-in Julia set is the complement of the unbounded Fatou component:

Relation between Julia, filled-in Julia set and attractive basin of infinity

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The Julia set is the common boundary of the filled-in Julia set and the attractive basin of infinity



where :
denotes the attractive basin of infinity = exterior of filled-in Julia set = set of escaping points for

If the filled-in Julia set has no interior then the Julia set coincides with the filled-in Julia set. This happens when all the critical points of are pre-periodic. Such critical points are often called Misiurewicz points.

Spine

The most studied polynomials are probably those of the form , which are often denoted by , where is any complex number. In this case, the spine of the filled Julia set is defined as arc between -fixed point and ,

with such properties:

Algorithms for constructing the spine:

Curve  :

divides dynamical plane into two components.

Images

Notes

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References

  1. Peitgen Heinz-Otto, Richter, P.H. : The beauty of fractals: Images of Complex Dynamical Systems. Springer-Verlag 1986. ISBN 978-0-387-15851-8.
  2. Bodil Branner : Holomorphic dynamical systems in the complex plane. Department of Mathematics Technical University of Denmark, MAT-Report no. 1996-42.