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collage theorem : ウィキペディア英語版
collage theorem
In mathematics, the collage theorem characterises an iterated function system whose attractor is close, relative to the Hausdorff metric, to a given set. The IFS described is composed of contractions whose images, as a collage or union when mapping the given set, are arbitrarily close to the given set. It is typically used in fractal compression.
== Statement of the theorem ==
Let \mathbb be a complete metric space. Suppose L is a nonempty, compact subset of \mathbb and let \epsilon \geq 0 be given. Choose an iterated function system (IFS) \ with contractivity factor 0 \leq s < 1, (The contractivity factor of the IFS is the maximum of the contractivity factors of the maps w_i.) Suppose
:h\left( L, \bigcup_^N w_n (L) \right) \leq \varepsilon,
where h(d) is the Hausdorff metric. Then
:h(L,A) \leq \frac
where ''A'' is the attractor of the IFS. Equivalently,
:h(L,A) \leq (1-s)^ h\left(L,\cup_^N w_n(L)\right) \quad, for all nonempty, compact subsets L of \mathbb.
Informally, If L is close to being stabilized by the IFS, then L is also close to being the attractor of the IFS.

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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