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en.wikipedia.org/wiki/Half-space_(geometry)

In geometry, a

mathworld.wolfram.com/Half-Plane.html

A half-plane is a planar region consisting of all points on one side of an infinite ...
If the points on the line are not included, then it is called an

encyclopedia2.thefreedictionary.com/open half plane

Looking for

www.virtualnerd.com/algebra-1/linear-inequalities/two-variables-graphing/graphing-coordinate-plane/half-plane-definition

Each of these halves is called a

www.easycalculation.com/maths-dictionary/half-plane.html

A half-plane is a planar region which consists all points on one side of an infinite
... then it is called closed half-plane; otherwise it is called

www.cliffsnotes.com/study-guides/algebra/algebra-i/coordinate-geometry/linear-inequalities-and-half-planes

If the inequality is a “>” or “<”, then the graph will be an

math.stackexchange.com/questions/1476660/prove-that-open-half-planes-are-open-sets

Oct 12, 2015

www.uzinggo.com/definition-open-closed-half-planes/planes/geometry

Points, Lines,

math.stackexchange.com/questions/1287011/how-to-show-that-the-right-half-plane-of-mathbbr2-is-homeomorphic-to-the-o

May 17, 2015

www.dictionary.com/browse/half-plane