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${\displaystyle{\displaystyle a|b}}$ ${\displaystyle{\displaystyle A_{j}=\frac{f(\alpha_{j})}{\prod\limits_{k\not=j}(\alpha_{j}-\alpha_{k})}}}$ ${\displaystyle{\displaystyle 2n!!}}$ ${\displaystyle{\displaystyle\sum_{n=0}^{\infty}\frac{1}{n}+1+n=n}}$ ${\displaystyle{\displaystyle\genfrac{(}{)}{0.0pt}{}{n}{0}+\genfrac{(}{)}{0.0pt}{}{n}{2}+\genfrac{(}{)}{0.0pt}{}{n}{4}+\dots+\genfrac{(}{)}{0.0pt}{}{n}{\ell}=2^{n-1},}}$