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The number of planes in cone
Would anybody know a good reference for the behaviour of the Sachs optical scalars of the null-geodesic generators of a light cone near the vertex (in...
Arcs on the top and bottom of the developable surface created by a vertical section of a cone
I'm restoring some 10' wooden colums that are tapered. I've decided to replace the bottom 10" with a plastic material. Not that it matters to the prob...