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- $(1): \quad$ Each point of $R$ is the center of a circle all of whose elements consist of points of $R$
- $(2): \quad$ Each point of $R$ can be joined by a curve consisting entirely of points of $R$.
- 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Entry: region