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Direction-Cosines of the Axes of the Conicoid

Published online by Cambridge University Press:  31 October 2008

Lawrence Crawford
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ax2 + by2 + cz2 + 2fyz + 2gzx + 2hxy = 1.

In Mathematical Notes, No. 20 (April 1916), there is a note on the above; I add a form of the equations of these axes which I have not seen in a text-book, and which is perhaps worth recording.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 21 , December 1916 , pp. 242 - 243
Copyright
Copyright © Edinburgh Mathematical Society 1916