Projectively extended real line: Difference between revisions

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{{Short description|Real numbers with an added point at infinity}}
{{about|the extension of the reals by a single point at infinity|the extension by {{math|+∞}} and {{math|–∞}}|Extended real number line}}
{{More cn|date=January 2023}}[[Image:Real projective line.svg|right|thumb|
[[File:Real Projective Line (RP1).png|right|thumb|
The projectively extended real line can be visualized as the real number line wrapped around a [[circle]] (by some form of [[stereographic projection]]) with an additional [[point at infinity]].]]