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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“The pleasures of the imagination are as it were only drawings and models which are played with by poor people who cannot afford the real thing.”
—G.C. (Georg Christoph)
“Where were you when I laid the foundation of the earth? Tell me, if you have understanding. Who determined its measurements—surely you know! Or who stretched the line upon it? On what were its bases sunk, or who laid its cornerstone when the morning stars sang together and all the heavenly beings shouted for joy?”
—Bible: Hebrew, Job 38:4 -7.
God, to Job.