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An Open Letter to the Math Students

At first, we sample in the ( is odd) equidistant points around : [ f_k = f(x_k),: x_k = x^*+kh,: k=-frac{N-1}{2},dots,frac{N-1}{2} ] where is some step. Then we interpolate points by polynomial begin{equation} label{eq:poly} P_{N-1}(x)=sum_{j=0}^{N-1}{a_jx^j}...