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Jan 4, 2014 at 15:57 vote accept James Propp
Jan 4, 2014 at 5:59 comment added James Propp By a "catastrophe" I meant a point in time beyond which the specified evolution rule cannot be applied. E.g., a billiards shot directly into a corner of a polygonal table is a catastrophe in my sense (even though in some cases, e.g. a rectangular table, there may be a natural way to evolve the system through the singularity).
Jan 4, 2014 at 2:08 answer added Douglas Zare timeline score: 6
Jan 4, 2014 at 0:55 answer added Joseph O'Rourke timeline score: 1
Jan 3, 2014 at 21:07 history asked James Propp CC BY-SA 3.0