An introductory account of certain modern ideas and methods in plane analytical geometry (1894)
Scott, Charlotte Angas, b. 1858 · London, New York : Macmillan and Co. · leaf 94
. For a pencil through imaginaiy points, tlie real conies fallinto two sets, no one of a set liaving real tangents in connnonwith any otlier of its set, but any one of a set having realtangents in common with any one of the other set (Fig. 24< (b)). DESCRIPTIVE PROPERTIES OF CURVES. 79 The two…
Geometry, Analytic -- Plane
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