In real analysis, the real projective line (also called the one-point compactification of the real line, or the projectively extended real numbers), is the set, also denoted by and by .
The symbol represents the point at infinity, an idealized point that bridges the two "ends" of the real line.
Read more about Real Projective Line: Dividing By Zero, Extensions of The Real Line, Order, Geometry, Algebraic Properties, Intervals and Topology, Interval Arithmetic, Calculus, Hyperbolic Involutions
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