Formula:KLS:09.04:14

{\displaystyle{\displaystyle{\displaystyle\frac{\delta p_{n}\!\left(x;a,b,c,d% \right)}{\delta x}=(n+a+b+c+d-1)p_{n-1}\!\left(x;a+\textstyle\frac{1}{2},b+% \textstyle\frac{1}{2},c+\textstyle\frac{1}{2},d+\textstyle\frac{1}{2}\right)}}}

Proof

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