Smart, Edward Howard · London : Macmillian and Co. · leaf 173
KK is the polar of S, XASA is a harmonicrange. .. the pencil K(KASA) and .. the range KPVA are har-monic. .. the polar of K passes through V. But it also passes through S. .*. it is KSV. Similarly SK is the polar of K—which proves the lemma. THE FOCI 145 Note. In the case of the hyperbola, S can be…
Geometry, Projective
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