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The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website. This time, we’re leaving it up to readers to guess what our latest cover represents. This past summer, Girls’ Angle program assistant … Continue reading →

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Which shape is worst of all for packing the plane? That is, which has the lowest maximal packing density? Suppose we demand that our shape be convex and also centrally symmetric: that is, a subset $S \subseteq \mathbb{R}^2$ such that $x \in S$ implies $-x \in S$. Then a certain 'smoothed octagon' is conjectured to be the worst. Amazingly, this shape has a 1-parameter family of maximally dense packings, shown in this image created by Greg Egan.

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As the day began, members of our student GRIT team began entering classrooms, handing teachers bags of treats. At first glance, a bag of candy. But when you opened, you quickly realized it was more than expected. There were slips of paper included…handwritten notes from students. The Student GRIT team has copied and dispersed these […]

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I used Battleships and Mines as a review for systems. We tested our mine coordinates today in the front lobby. And then enjoyed the end of the week with the highlighters and blacklights.

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mindfuckmath:
Vampire Numbers
Do you vant to learn about vampire numbers? Vampire numbers are numbers of even length that can be factored into two integers of equal length, both of which are comprised of the digits from the original number, and neither of which contain trailing zeroes. The two integers are called the fangs. For example,
1260 = 21 x 60
1260 is the vampire number, 21 and 60 are its fangs.
1395 = 15 x 93
1395 is the vampire number, 15 and 93 are its fangs.
Vampire numbers
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rmathematicus tweeted: @rmathematicus

Robert Fripp being rather candid in the Torygraph http://t.co/GS88GwVNte

2014-11-01 09:40:31

MindAfterMath tweeted: @MindAfterMath

2014-11-01 09:36:33

rmathematicus tweeted: @rmathematicus

RT @ferwen Born Nov 1,1857: John Joly, Irish geologist. He wrote a sonnet about the ichnogenus Oldhamia http://t.co/hkaIA8o3gI

2014-11-01 09:33:36

rmathematicus tweeted: @rmathematicus

RT @trueanomalies: Squirrels, whales, horses, & pigs: really neat article on animal history from @ResObscura! http://t.co/nvUJJ9713Z #histS…

2014-11-01 09:31:40

rmathematicus tweeted: @rmathematicus

RT @SpoonsOnTrays: It’s not technology shaping taste, but the human desire to connect, share and evaluate culture @GdnCulturePros http://t…

2014-11-01 09:29:55

rmathematicus tweeted: @rmathematicus

RT @keithalink The Story Behind Lou Reed’s “Walk on the Wild Side” Bass Line http://t.co/OhJP2yXo3C v @notreble @TheRoyalKJ

2014-11-01 09:23:54

rmathematicus tweeted: @rmathematicus

RT @Libroantiguo: Cometographia quaedam l..] 1577. Johnson, Laurence- STC 1416 Houghton Library, Harvard University http://t.co/sdDNIWIj2T

2014-11-01 09:05:11

AppreciateMath tweeted: @AppreciateMath

The Great Mosque of #Medan (Masjid Raya) was built in 1906 in the Moroccan style by the Dutch… http://t.co/GCnwWRfXqT

2014-11-01 08:50:31

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