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Published online by Cambridge University Press: 31 October 2008
1. In a tetrahedron ABCD with its opposite edges perpendicular there are two tetrahedra which can be described as pedal tetrahedra. (1) the tetrahedron A0B0C0D0 where these points are the feet of the perpendiculars from ABCD on to the faces BCD.
1 Math. Notes 30, 05 1937.Google Scholar