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May 13, 2010 at 3:17 answer added Joel David Hamkins timeline score: 2
May 12, 2010 at 18:47 answer added Niall Murphy timeline score: 0
May 12, 2010 at 18:37 answer added Grigory Yaroslavtsev timeline score: 6
May 12, 2010 at 8:43 comment added Neel Krishnaswami @Aryeh: I edited your question to reflect your comment.
May 12, 2010 at 8:42 history edited Neel Krishnaswami CC BY-SA 2.5
Fixed question
May 12, 2010 at 8:06 comment added Aryeh Kontorovich Oops, my mistake!!! I didn't mean emptiness -- I meant L(NFA) = \Sigma^*. That is, rather than checking whether NFA accepts no strings (trivial) I want to know if it accepts ALL strings.
May 12, 2010 at 7:48 comment added Harry Altman Can't emptiness just be determined by searching the graph? That's O(n^2) at most, right?
May 12, 2010 at 7:30 history asked Aryeh Kontorovich CC BY-SA 2.5