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Topological conjugation : ウィキペディア英語版
Topological conjugacy
In mathematics, two functions are said to be topologically conjugate to one another if there exists a homeomorphism that will conjugate the one into the other. Topological conjugacy is important in the study of iterated functions and more generally dynamical systems, since, if the dynamics of one iterated function can be solved, then those for any topologically conjugate function follow trivially.
To illustrate this directly: suppose that and are iterated functions, and there exists an such that
:g=h^\circ f\circ h,
so that and are topologically conjugate. Then of course one must have
:g^n=h^\circ f^n\circ h,
and so the iterated systems are conjugate as well. Here, ○ denotes function composition.
==Definition==
Let and be topological spaces, and let f\colon X\to X and g\colon Y\to Y be continuous functions. We say that is topologically semiconjugate to if there exists a continuous surjection h\colon Y\to X such that f\circ h=h\circ g.
If is a homeomorphism, we say that and are topologically conjugate and we call a topological conjugation between and .
Similarly, a flow on is topologically semiconjugate to a flow on if there is a continuous surjection h\colon Y\to X such that \varphi(h(y),t) = h\psi(y,t) for each y\in Y, t\in \mathbb. If is a homeomorphism, then and are topologically conjugate.

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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