Wallis Sieve Pi Approximation
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The Wallis Sieve approximates the area of the unit disk by an infinite product. This approximation——converges slowly.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
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"Wallis Sieve Pi Approximation"
http://demonstrations.wolfram.com/WallisSievePiApproximation/
Wolfram Demonstrations Project
Published: March 7 2011