The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)
Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 179
r of I^. In this way the formulaeof the last section represent the polar of (-^i ,71) even if thispoint lies on the conic. There is one other case in which our definition of a polarbreaks down, namely when P lies at the centre of the conic ; forin this case all chords through P are bisected there,… … 172 ANALYTIC GEOMETRY. figure). In this case the lineP^P^ is the polar of P. For ifwe allow the secant P C D \o turn around P and approach theposition of the tangent P P^diS a. limit, both the points C and Dapproach the point P^ as their limits, and since Q always liesbetween C and P>, it must…
Geometry, Analytic -- Plane
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