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Lipschitz domain : ウィキペディア英語版
Lipschitz domain
In mathematics, a Lipschitz domain (or domain with Lipschitz boundary) is a domain in Euclidean space whose boundary is "sufficiently regular" in the sense that it can be thought of as locally being the graph of a Lipschitz continuous function. The term is named after the German mathematician Rudolf Lipschitz.
==Definition==

Let ''n'' ∈ N, and let Ω be an open subset of R''n''. Let ∂Ω denote the boundary of Ω. Then Ω is said to have Lipschitz boundary, and is called a Lipschitz domain, if, for every point ''p'' ∈ ∂Ω, there exists a radius ''r'' > 0 and a map ''h''''p'' : ''B''''r''(''p'') → ''Q'' such that
* ''h''''p'' is a bijection;
* ''h''''p'' and ''h''''p''−1 are both Lipschitz continuous functions;
* ''h''''p''(∂Ω ∩ ''B''''r''(''p'')) = ''Q''0;
* ''h''''p''(Ω ∩ ''B''''r''(''p'')) = ''Q''+;
where
:B_ (p) := \ | \| x - p \| < r \}
denotes the ''n''-dimensional open ball of radius ''r'' about ''p'', ''Q'' denotes the unit ball ''B''1(0), and
:Q_ := \) \in Q | x_ = 0 \};
:Q_ := \) \in Q | x_ > 0 \}.

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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