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Re: Re: An informal introduction to O(N) notationby dakkar (Hermit) 
on Mar 25, 2003 at 14:26 UTC ( #245691=note: print w/ replies, xml )  Need Help?? 
Nitpicking: 'Ο' is used for an estimate in excess (it's supposed to be a capital omicron, not an 'oh') 'Ω' is used for an estimate in defect (omega "is bigger" than omicron) 'Θ' is used for the actual growth. For example: mergesort is Ω(1), Ο(n^{2}), Θ(n log n) This is important since it's quite common to know boundaries on the complexity, but not the exact complexity. For example, matrix multiplication is Ω(n^{2}) (you have to generate all the elements), and surely Ο(n^{3}) (there is a naif algorithm with that complexity), but we don't know the exact function.  dakkar  Mobilis in mobile
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