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half-plane
[ haf-pleyn, hahf- ]
noun
, Mathematics.
- the part of the plane on one side of a straight line of infinite length in the plane.
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Word History and Origins
Origin of half-plane1
First recorded in 1890–95
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Example Sentences
As another illustration we may take the conformal representation of an equilateral triangle upon a half plane.
From Project Gutenberg
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