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May 10, 2011 at 14:28 comment added Sergei Ivanov @Joseph: just rescale the whole configuration to get the same radii.
May 10, 2011 at 14:15 comment added Igor Rivin I think most people on this forum did, for better or worse...
May 10, 2011 at 4:22 comment added Tom Church A good personality test: if someone offered you the chance to become sadder and wiser, would you take it?
May 9, 2011 at 21:44 comment added Joseph O'Rourke I thought that the Kneser-Poulsen conjecture (now theorem in the plane) involved moving the centers and fixing the radii, whereas this question is fixing the centers and altering the radii. But perhaps there is some relationship...
May 9, 2011 at 21:07 history answered Igor Rivin CC BY-SA 3.0