Girard Desargues
French mathematician and engineer · Academics · Lived 1591 to 1661 · aged 70
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A typical day, 30 days to 17 September 2026
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Something wrong?A French mathematician who saw geometry from a position no one had taken before - through the eye of perspective itself - and built the scaffolding that would become projective geometry.
A life in dates
Also in Deutsch
Photos 8
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In their own words 3
, He who shall wish to disentangle this proposition will easily be able to compose a volume.
Parallel lines have a common end point at an infinite distance.
When no point of a line is at a finite distance, the line itself is at an infinite distance.
About this person
Girard Desargues was born on 21 February 1591 in France, trained as an engineer, and worked in a world where math served architecture and optics. Somewhere in that practical grind he made the leap: he began studying what happens to shapes when you project them, when parallel lines meet at infinity, when you stop assuming Euclid's flat playground. The work was so foundational that a theorem, a graph structure, and a crater on the Moon all carry his name. He died in September 1661, leaving behind ideas that wouldn't fully mature until centuries later.
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