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A Geometrical Proof of a Theorem connected with the Tetrahedron

Published online by Cambridge University Press:  20 January 2009

H. F. Thompson
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1. The six planes through the middle points of the edges of a tetrahedron perpendicular to the opposite edges are concurrent.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 27 , February 1909 , pp. 51 - 53
Copyright
Copyright © Edinburgh Mathematical Society 1909

References

* Systematische Entwickelung der Abhängigkeit geometriseher Gestalten von einander (problem 39 of the supplement), Gesammelte Werke, vol. 1, p. 446Google Scholar; Vermischte Sätze und Aufgaben, ibid., vol. 2, p. 675.

† Bulletin des sciences mathématiques et astronomiques, ser. 2, vol. 7 (1883), pp. 314–324.Google Scholar

‡ Second series, vol. 3, No. 4 (1902), On some curves connected with a system of similar conics.

§ Vol. 4, No. 1 (1903), On the envelope of the axes of a system of conics passing through three fixed points.

* Collected Mathematical Papers, vol. 7, p. 568.Google Scholar

* See the paper entitled, On some curves, etc., referred to above.Google Scholar

* See the paper entitled, On the envelope of the axes, etc., referred to above.Google Scholar