Foci

Christopher Baltus ()
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Christopher Baltus: State University of New York at Oswego, Department of Mathematics

Chapter Chapter 9 in Collineations and Conic Sections, 2020, pp 117-126 from Springer

Abstract: Abstract It is a formidable challenge to include foci in a projective treatment of the conic sections. They are, of course, not preserved under projection. Poncelet wrote in his 1822 Traité, Art. 446: “Although the properties of foci (foyers) …seem to not be among those we have called projectives, …they follow nevertheless in a very simple manner from foundational principles ….” Foci

Date: 2020
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DOI: 10.1007/978-3-030-46287-1_9

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