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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

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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

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 1916