Region (mathematics)

In mathematical analysis, the word region usually refers to a subset of $\R^n$ or $\C^n$ that is open (in the standard Euclidean topology), connected and non-empty. A closed region is sometimes defined to be the closure of a region.

Regions and closed regions are often used as domains of functions or differential equations.

单词	Closed region
释义	Closed region 英语百科 Region (mathematics) In mathematical analysis, the word region usually refers to a subset of $\R^n$ or $\C^n$ that is open (in the standard Euclidean topology), connected and non-empty. A closed region is sometimes defined to be the closure of a region. Regions and closed regions are often used as domains of functions or differential equations.
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Closed region

Region (mathematics)