a | b conditional ð ð {\displaystyle{\displaystyle a|b}} A j = f ⢠( α j ) â k â j ( α j - α k ) subscript ð´ ð ð subscript ð¼ ð subscript product ð ð subscript ð¼ ð subscript ð¼ ð {\displaystyle{\displaystyle A_{j}=\frac{f(\alpha_{j})}{\prod\limits_{k\not=j}% (\alpha_{j}-\alpha_{k})}}} 2 ⢠n !! 2 double-factorial ð {\displaystyle{\displaystyle 2n!!}} â n = 0 â 1 n + 1 + n = n superscript subscript ð 0 1 ð 1 ð ð {\displaystyle{\displaystyle\sum_{n=0}^{\infty}\frac{1}{n}+1+n=n}} ( n 0 ) + ( n 2 ) + ( n 4 ) + ⦠+ ( n â ) = 2 n - 1 , binomial ð 0 binomial ð 2 binomial ð 4 ⦠binomial ð â superscript 2 ð 1 {\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},}} Ai â² â¡ ( 0 ) diffop Airy-Ai 1 0 {\displaystyle{\displaystyle\mathrm{Ai}'\left(0\right)}} w:Test