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Note on normals to conics

Published online by Cambridge University Press:  20 January 2009

R. H. Pinkerton
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1. The following condition may be new; it does not appear in any of the books:—

The condition that the straight line

should be a normal to the general conic,

referred to rectangular axes, is

where Σ is written for

and Δ, A, B, C, F, G, H have their usual meanings.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 8 , February 1889 , pp. 19 - 21
Copyright
Copyright © Edinburgh Mathematical Society 1889

References

* Salmon's Conics—Fifth Edition—Art. 374.