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要顯示3N^2 - 25N =Ω(N^2)大歐米茄符號證明
For n ≥ n/2 for n ≥ 0
n – 25/3 ≥ 3n/(2 x 25) for n ≥ 9
3n^2 - 25n ≥ 9n^2/50 for n ≥ 9
3n2 - 25n ≥ c·n2 for n ≥ n0 where c=9/50 and n0 = 9
Therefore, by definition
3n2 - 25n = Ω(n2).
以上就是證明3N^2 - 25N =Ω(N^2)。爲什麼用n≥n/2?
n - 25/3≥3n /(2 x 25)如何導出?