Category Archives: people

Fibonacci’s Problem of the Birds

I have been enjoying reading Keith Devlin’s new book, Finding Fibonacci. I’ll write more about the book later. For now, I just wanted to share a nice problem I learned about which Leonardo Pisano, aka Fibonacci, included in his book … Continue reading

Posted in algebra, arithmetic, challenges, people | Tagged , , | 6 Comments

Book review: Genius at Play

Back in January I mentioned that I had been enjoying Siobhan Roberts’s new biography, Genius at Play: The Curious Mind of John Horton Conway. I finally finished it, and can now officially say that I really enjoyed it. This is … Continue reading

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17×17 4-coloring with no monochromatic rectangles

Quick, what’s special about the following picture? As just announced by Bill Gasarch, this is a grid which has been four-colored (that is, each point in the grid has been assigned one of four colors) in such a way that … Continue reading

Posted in open problems, pattern, people, pictures | Tagged , , , , , | 5 Comments

Herbert Wilf: 13 June 1931 – 7 January 2012

I was sad to learn that Herbert Wilf died yesterday. Long-time readers of this blog may remember him as one of the discoverers of the Calkin-Wilf tree, which I wrote about in a ten-part series of posts (1, 2, 3, … Continue reading

Posted in people | Tagged | 1 Comment

Book review: Magical Mathematics

Occasionally someone from Princeton University Press sends me a list of upcoming titles and asks if there are any I’d like to review. I jumped when I saw this one: a book about magic tricks and math! By Persi Diaconis … Continue reading

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Relatively Prime: Stories from the Mathematical Domain

Samuel Hansen needs your help! He’s currently raising money to create a series of podcasts explaining math to a wide audience. From the linked video, it looks like they will be a lot of fun, and I think it would … Continue reading

Posted in links, people | Tagged , ,

The wonderful world of Mike Reilly

The other day I received an email from Mike Reilly, who introduced himself as a professional game and puzzle inventor, and suggested that I might be interested in taking a look at a few of his web sites. I wasn’t … Continue reading

Posted in games, links, people, puzzles | Tagged , , , , , | 2 Comments