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Jun 22, 2012 at 14:16 answer added Jérémy Blanc timeline score: 3
Jun 21, 2012 at 14:33 comment added Tim Southee Johannes, the coefficients come from the structure equations of a mechanical system. In this case, the quadric in question is a hyperbolic paraboloid.
Jun 21, 2012 at 8:03 comment added Johannes Nordström Where do the coefficients come from? Note that the line $Z_3 = Z_4 = 0$ is contained in the intersection of any two quadrics with $q_1 = 0$.
Jun 21, 2012 at 5:50 history asked Tim Southee CC BY-SA 3.0