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    I bought three.onefouronefivenine.com

    By Christian Lawson-Perfect. Posted March 13, 2015

    I’m a big fan of novelty domain names: I once bought hotmathematicians.com just so that christian@hotmathematicians.com could be my corresponding address when I submitted a paper. That domain has expired, but my love for one-shot novelty purchases has not! To celebrate π day this year, I decided that it should be possible to type a little…

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    Travels in a Mathematical World

    π approximation: Machin’s formula

    By Peter Rowlett. Posted March 13, 2015

    In the excellent $\pi$ approximation video, Katie Steckles asked for $\pi$ approximations. I teach a first year techniques module (mostly calculus and a little complex numbers and linear algebra). This year I have changed a few bits in my module; in particular I gave some of my more numerical topics to the numerical methods module…

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    Blackboard Bold

    π and the Mysterious Excel Function

    By Paul Taylor. Posted March 12, 2015

    Users of Microsoft’s flagship 2D-array-based data-organisation tool Excel will be aware of some if its more recondite functions. From the occasionally useful RIGHT: returns the substring of a given length from the right-hand end of a cell’s contents to the wilfully obscure TBILLPRICE: gives “the price per $100 face value for a Treasury bill” when supplied…

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    Videos

    Matt Parker approximates π by weighing a circle

    By Christian Lawson-Perfect and Matt Parker. Posted March 12, 2015

    OK Matt, what have you got?

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    Irregulars

    π, Phase Space, and Bouncing Billiard Balls

    By Colin Wright. Posted March 12, 2015

    There are many ways to estimate or calculate π, that number that is irrational, but well-rounded. But perhaps none is as remarkable as that outlined in a 2013 paper by G. Galperin. In this brief article we’ll have a look at the problem, and see the setting, although we’ll leave the interested reader to hunt…

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    Irregulars

    π and The Simpsons

    By Simon Singh. Posted March 11, 2015

    In “The Simpsons and Their Mathematical Secrets”, I documented all the mathematical references hidden in the world’s favourite TV show. Look carefully at various episodes, you will spot everything from Fermat’s last theorem to the Riemann hypothesis, from the P v NP conjecture to Zorn’s lemma. All these references are embedded in the show, because…

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    Irregulars

    Alex Bellos’s π Day blog post

    By Alex Bellos. Posted March 11, 2015

    For a blog, I write sentences. Of Pilish words. It’s truly difficul.

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