瓦尔斯公式的推广

One Generalization of Wallis′ Product

对著名的瓦尔斯公式Пk=1^∞ 2k(2k+2)/(2k+1)^2=π/4，利用p函数的无穷积形式及特殊情形P（1/2)=√π的变形，从而推广了瓦尔斯公式，使其成为特例。

One generalization of Wallis′s product :Π∞k=12k(2k+2)(2k+1)2=π4is given in this paper,where k and l are positive integers.It is clear that as l=1 this formula is the famous Wallis′s product.