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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}}
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.]]
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