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Roots of Unity

Roots of Unity

Mathematics: learning it, doing it, celebrating it.

Mathematicians Predict What's in Your Wallet

It's all about the Washingtons. And that smiley face button. Image: flickr user xJason.Rogersx CC BY 2.0 When I go to Europe, my pockets rapidly fill up with change.

June 20, 2013 — Evelyn Lamb

My Head Is Not a Hairy Ball

I've been thinking about the hairy ball theorem a lot recently. Because I have the sophisticated sense of humor of a twelve-year-old just got a haircut, and I am newly reminded of my cowlicks...

May 31, 2013 — Evelyn Lamb

Strumming the Lute of Pythagoras

When I was at the Joint Math Meetings in January, the evocative name "Lute of Pythagoras" jumped out at me in a talk by Ann Hanson of Columbia College in Chicago.

May 29, 2013 — Evelyn Lamb

Goldbach Variations

Harald Helfgott, who earlier this week posted a proof of the ternary Goldbach conjecture. Image: Harald Helfgott. On Monday, Harald Helfgott of the École Normale Supériure in Paris posted a proof of one of the oldest open problems in number theory to the preprint repository arxiv...

May 15, 2013 — Evelyn Lamb

Mathy Ladies to Follow on Twitter

Image: Design Shack In the current issue of the Association for Women in Mathematics newsletter (password required), Anne Carlill asks where the female mathematicians are on Twitter: "I found that the only female mathematicians or math educators I followed were Nalini Joshi in Sydney and Fawn Nguyen in California...

April 24, 2013 — Evelyn Lamb

Big Numbers Are Big

SOS, 181418, appears starting at the 1,377,767th digit of pi. Image: xkcd. Today I have a piece in Slate about that pi meme that's been going around.

April 17, 2013 — Evelyn Lamb

91 Is April Fooling You

7 × 13 pieces of beach glass found on the shore of Lake Michigan and arranged on my coffee table. Rather appropriately, April 1st is the 91st day of the year, at least in non-leap years such as 2013...

April 1, 2013 — Evelyn Lamb

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