a | b conditional π π {\displaystyle{\displaystyle a|b}} A j = f β’ ( Ξ± j ) β k β j ( Ξ± j - Ξ± k ) subscript π΄ π π subscript πΌ π subscript product π π subscript πΌ π subscript πΌ π {\displaystyle{\displaystyle A_{j}=\frac{f(\alpha_{j})}{\prod\limits_{k\not=j}% (\alpha_{j}-\alpha_{k})}}} 2 β’ n !! 2 double-factorial π {\displaystyle{\displaystyle 2n!!}} β n = 0 β 1 n + 1 + n = n superscript subscript π 0 1 π 1 π π {\displaystyle{\displaystyle\sum_{n=0}^{\infty}\frac{1}{n}+1+n=n}} ( n 0 ) + ( n 2 ) + ( n 4 ) + β¦ + ( n β ) = 2 n - 1 , binomial π 0 binomial π 2 binomial π 4 β¦ binomial π β superscript 2 π 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 β² β‘ ( 0 ) diffop Airy-Ai 1 0 {\displaystyle{\displaystyle\mathrm{Ai}'\left(0\right)}} w:Test