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Feb 15, 2014 at 16:27 history edited Tayfun Pay CC BY-SA 3.0
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Sep 14, 2011 at 12:19 comment added Tayfun Pay There are two types if counting hierachies defined. One by Valiant in1979 and he uses the notation #P, #NP,#Co-NP... Where #NP=Co-NP. On the other hand Toda defined a different hierarchy. And the notation for that uses dots. And #.NP!=#.Co-NP unless NP=Co-NP
Sep 14, 2011 at 4:30 comment added Timothy Sun What does the period refer to in "#.NP"?
Sep 6, 2011 at 1:38 comment added Tayfun Pay It is the counting version of NP.
Sep 6, 2011 at 1:38 history edited Tayfun Pay CC BY-SA 3.0
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Sep 5, 2011 at 15:58 history answered Tayfun Pay CC BY-SA 3.0