A Treatise On Conic Sections Containing An Account of Some of the Most Importan
A Treatise On Conic Sections Containing An Account of Some of the Most Importan
George Salmon
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+ &c. + h [a'aa! + &:g. ]. Hence, given four points on a conic^ the polar of any given point lyasses through a fixed point (Ex. 2, p. 148). If Q and Q be the polars of another point with regard to S and /S", then the polar of this second point with regard to S-\-kS' 260 METHODS OF ABPIDOED NOTATION. is Q-\-hQ', Thus, then, (see Art. 59) the polars of two points ■with regard to a system of conies through four points, form two homographie pencils of lines. Given two homograj)1iic iiencils of line...Sj the locus of the inter- section of the corref^ponding lines of the pencils is a conic through the vertices of the jpe^xcils. For, if we eliminate h between F-^hP^ Q-{-hQ\ we get PQ' = P'Q. In the particular case tmder consideration, the intersection of P-\-kP\ Q + kQ' is the pole with respect to S + Jc8' of the line joining the two given points. And we see that, given four jwints on a conic^ the locus of the pole of a given line is a conic (Ex. 1, p. 243). If an indeterminate enter in the second degree into the equation of a conic, it must also enter in the second degree into the equation of the polar of a given point, which will then envelope a conic.
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