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Abstract: 9.47> XX= 1 2 (-a + d + f ), YY = 1 2 (a - d + f ), ZZ= 1 2 (a + d - f ), XY =-b, XZ =-c, YZ=-e. Note that YY + ZZ = a, XX+ ZZ = d , XX+ YY = f . Then observe that every (necessarily real) eigenvalue of a real symmetric matrix is associated with a real eigenvector. This note is dedicated to Gus Watts (1916--2000), a retired aeronautical engineer, who died shortly after crafting for the author a tetrahedron of solid poplar through which holes were bored by a sp (Update)
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BibTeX entry: (Update)
@misc{ eppstein-tangent,
author = "David Eppstein",
title = "Tangent Spheres and Triangle Centers",
url = "citeseer.ist.psu.edu/eppstein01tangent.html" }
Citations (may not include all citations):2 Triangle Centers and Central Triangles (context) - Kimberling - 1998
1 Modern Pure Solid Geometry (context) - Altshiller-Court - 1964
1 and possible transfiguration of triangle geometry: a mini-hi.. (context) - Davis, rise - 1995
1 The Euler-Gergonne-Soddy triangle of a triangle (context) - Oldknow - 1996
1 A theorem concerning Soddy-circles (context) - Veldkamp - 1966
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Linear Complexity Hexahedral Mesh Generation - Eppstein (1996) (Correct)
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