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Jul 12, 2016 at 12:29 comment added PrimeRibeyeDeal Ah, ok. Thanks! The Möbius function must certainly rank among the functions with the highest usefulness to number-of-possible-output-values ratio.
Jul 11, 2016 at 18:18 comment added Qiaochu Yuan @Prime: a nonnegative integer matrix is the adjacency matrix of some graph (directed, multi). The Mobius-inverted quantities above count the number of aperiodic walks on this graph of length $n$.
Jul 11, 2016 at 16:12 comment added PrimeRibeyeDeal What made you suspect that the Moebius conversion would be relevant?
Apr 3, 2011 at 23:35 history edited Qiaochu Yuan CC BY-SA 2.5
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Apr 3, 2011 at 23:32 vote accept Qiaochu Yuan
Apr 3, 2011 at 23:00 answer added Douglas Lind timeline score: 33
Nov 25, 2009 at 21:11 history edited Philipp Lampe
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Nov 5, 2009 at 13:20 answer added Gray Taylor timeline score: 3
Nov 4, 2009 at 1:40 answer added Qiaochu Yuan timeline score: 1
Nov 4, 2009 at 0:45 answer added Ian Agol timeline score: 1
Nov 3, 2009 at 21:18 answer added moonface timeline score: 4
Nov 3, 2009 at 17:59 history edited Qiaochu Yuan CC BY-SA 2.5
Changed wording.
Nov 3, 2009 at 17:53 answer added Gray Taylor timeline score: 0
Nov 3, 2009 at 15:40 history edited Qiaochu Yuan CC BY-SA 2.5
Fixed wording.
Nov 3, 2009 at 15:06 answer added Ben Webster timeline score: -1
Nov 3, 2009 at 15:02 history edited Qiaochu Yuan CC BY-SA 2.5
Added a condition.
Nov 3, 2009 at 14:47 history asked Qiaochu Yuan CC BY-SA 2.5