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Orbit portrait
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Orbit portrait : ウィキペディア英語版
Orbit portrait

In mathematics, an orbit portrait is a combinatorial tool used in complex dynamics for understanding the behavior of one-complex dimensional quadratic maps.
In simple words one can say that it is :
* a list of external angles for which rays land on points of that orbit
* graph showing above list
==Definition==
Given a quadratic map
:f_c : z \to z^2 + c. \,
from the complex plane to itself
:f_c : \mathbb \to \mathbb \,
and a repelling or parabolic periodic orbit = \ of f\,, so that f(z_j) = z_\, (where subscripts are taken 1 + modulo n), let A_j be the set of angles whose corresponding external rays land at z_j\,.
Then the set = () = \ is called the orbit portrait of the periodic orbit .
All of the sets A_j\, must have the same number of elements, which is called the valence of the portrait.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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