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On the Direction-Cosines of the Axes of the Conicoid f(xyz) ≡ ax2 + by2 + cz2 + 2fyz + 2gzx + 2hxy = 1

Published online by Cambridge University Press:  31 October 2008

R. J. T. Bell
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Some time ago I received from Dr Muirhead the following theorem:—“If lr, mr, nr (r=1, 2, … 3) are the direction-cosines of the axes of the conicoid

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Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 20 , April 1916 , pp. 229 - 230
Copyright
Copyright © Edinburgh Mathematical Society 1916