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...igin, then its partner must be at an infinite distance from the origin. If from any point ''P'' lines be drawn through the six points, these lines cut any ...t line may be considered as meeting at infinity, and that parallels differ from other pairs of lines only in having their points of intersection at infinit ...

...etails/historyofchemist02thoruoft/page/n10/mode/1up?view=theater Vol. II.] From 1850 to 1910 (1910).<!--History of Chemistry (book)--> ===Volume 1. From the Earliest Times to the Middle of the Nineteenth Century (1909)=== ...

...k mathematician, 3rd century BC, as imagined by [[Raphael]] in this detail from ''The School of Athens''.<ref>No likeness or description of Euclid's physic ...s does not correspond to simple observation … [[Euclid]]'s postulates came from the Pythagorean theorem, not the other way around. ~ [[Richard Hamming]] ]] ...