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region


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A connected subset of 2-dimensional space. For example, the set of points (x, y) satisfying (x−3)2+(y+1)2 < 4 is the interior of a circle, radius 2, centred at (3,−1) and is an open region. If the inequality was≤then the circle itself would be included and it would be a closed region.

Subjects: Mathematics.


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