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\forall B \subset A
\sum_{k=0}^n a_k a_{n-k}=1
a_0=1
Df(x)=\Delta f(x)
a_{i,j}=\frac{(i!)^j}{(ij)!}\ ,\ \ b_j=\lim_{i \to \infty}\frac{a_{i+1,j}}{a_{i,j}}