Bernstein polynomials

Bernstein多项式能够用来一致逼近闭区间上的连续函数。
对于[0,1]上的连续函数f(x),定义Bernstein多项式
B_n(f,x) = sum{k=0..n} f(k/n)C(k,n)t^k(1-t)^(n-k) // 当中C(k,n)是n取k的组合数。
一般的闭区间做一次仿射变换就能够了。

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