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Jun 3, 2015 at 10:44 comment added Joseph O'Rourke He proves that if all the shadows are simply connected, then the body casting those shadows is convex---Beautiful!
Jun 3, 2015 at 10:08 comment added Joseph O'Rourke Link to Ghomi paper: PDF download.
Jun 3, 2015 at 3:15 history answered Richard Montgomery CC BY-SA 3.0