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Feb 2, 2010 at 16:50 comment added B. Bischof I have fixed the previous error, sorry for the confusion. However, thanks for this observation.
Feb 2, 2010 at 6:14 comment added Qiaochu Yuan I should also add that I guess this is a reasonable heuristic argument that this problem is at least as hard as factoring.
Feb 2, 2010 at 6:04 history answered Qiaochu Yuan CC BY-SA 2.5