Projection of Conic Section is Conic Section/Historical Note
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Historical Note on Projection of Conic Section is Conic Section
Girard Desargues developed the concept of the conic section in the context of projective geometry.
Hence he was able to demonstrate Projection of Conic Section is Conic Section.
This was widely disregarded at the time, caused in part by the obscure terminology he used, but also because the influence of projective geometry was overshadowed by the contemporary development of analytic geometry.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): conic (conic section)
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): conic (conic section)