Pi Approximation Day  22/7  July 22  Casual Pi 

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more Pi Tshirts, Posters, and mugs: 

some other math Tshirts and posters:
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The Famous Mathematicians 



Property of the Math Department series 



In the Beginning  The Quantum Physics of Creation series 


The Golden Mean series 




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Pi Approximation Day July 22 Pi 22/7 Pi Casual Pi 