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open set

noun (maths)
1.
a set which is not a closed set
2.
an interval on the real line excluding its end points, as [0, 1], the set of reals between, but excluding, 0 and 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for open set
Historical Examples
  • The Prince presented an open set of features, well formed by nature, and accurately moulded by art to the rules of courtesy.

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6
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