The Wallis product is a formula found in 1655 by

**John Wallis**, which calculates the simple infinite product:http://en.wikipedia.org/wiki/Infinite_product#Product_representations_of_functions

http://mathworld.wolfram.com/

**PippengerProduct**.html

http://en.wikipedia.org/wiki/Vi%C3%A8te%27s_formula

From the Wallis formula you can also get:

In Wolfram MathWorld site:

you can find an extensive list of infinite products. In particular, the formula obtained above is a simple case (21) of a more general set (D.W.Cantrell, 2006)

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