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On the Discrimination of Conics enveloped by the rays joining the corresponding points of two projective ranges
Published online by Cambridge University Press: 20 January 2009
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It is evident in the first place as is pointed out by Steiner that the conic will be a parabola if, and cannot be a parabola unless the point at infinity on one range correspond to the point at infinity on the other, that is, the two ranges must be similar. This is the converse of the well-known proposition that a movable tangent to a parabola divides two fixed tangents similarly.
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- Copyright © Edinburgh Mathematical Society 1883