## Wild About Math bloggers 1/21/11

[ The 1/28 edition is at Equalis. Here's last week's edition. ]

Welcome to another edition of Wild About Math Bloggers!

Alex Bellos introduces us to Lee Sallow's fascinating work with Geomagic squares.

[Sallow] realised that you could create a much more versatile magic square, which he calls a

geomagic square. Instead of containing numbers, it contains shapes, and that the combination of shapes that you get in each row, column and diagonal can be pieced together to make the same master shape.

Built on Facts has a nice introduction to the zeta function and on its relationship to prime numbers. Hat tip to Shecky.

## Wild About Math bloggers 1/14/11

[ The 1/21/ edition is at Equalis. Here's last week's article. ]

Here's my roundup of this second week of January!

Carnival of Mathematics #73 is up at Walking Randomly.

Maxwell's Demon has an interesting spin on the prisoner's dilemma, in a group setting.

Last semester I offered my students $1,000,000 dollars. They turned me down. This was lucky, despite the money and glamour of academic mathematics, I do not have a million dollars. The game was simple. The class of 100 each had to write a number. The highest number won. Of course there was a catch, the prize was $1,000,000 divided by the winning number. The best outcome for the students as a whole would come if everyone wrote 1, $10,000 is not a bad return for a lecture. Of course if everyone is writing 1, the person who writes 2 wins and makes far more for themselves. What happened?

Here's a very interesting piece of number trivia:

Every number greater than 8 has at least two letters in common with each of its neighbors.

Hat tip to Futility Closet.

## Great article about Vi Hart in the New York Times

Check out Bending and Stretching Classroom Lessons to Make Math Inspire at the New York Times. It's a great interview with Vi Hart. You'll need a free account at the New York Times to read the article.

I didn't know that Hart graduated with a degree in music and never took a math course in college. Just two years after graduating she has produced amazing work!

## Wild About Math bloggers 1/7/11

[ The 1/14 Wild About Math Bloggers! post is at Equalis. ]

Happy New Year, Everybody! Here's some fun stuff from the Math web.

Shecky has an in-depth review of Princeton University Press's new book: Loving and Hating Mathematics.

Gary Davis at the Republic of Mathematics has a fun article about the number 2011. Not only is 2011 prime but it is also the sum of 11 consecutive prime numbers. Wow!

## An interesting problem with sums

Check out this brand new video by James Tanton. In it, he tackles a problem I've personally enjoyed solving; determining which positive integers can be written as a sum of consecutive positive integers. For example, 6 = 1+2+3, 7=3+4, but 8 can't be written as a sum of consecutive integers.

The video tackles this problem in Tanton's landmark style, with dots!

[youtube]http://www.youtube.com/watch?v=Rc4NDQnqoLM[/youtube]

And, as usual, there's an extra credit problem.

Enjoy!

## New Google phone app solves sudoku

Check out this New Scientist article and the video below. Wow!

[youtube]http://www.youtube.com/watch?v=rdftOloAH9Q[/youtube]

Hat tip to Equalis.

## Wild About Math bloggers 12/31/10

[ The new edition of Wild About Math Bloggers! is at Equalis. Here's the previous edition. ]

Here's our last Wild About Math Bloggers! of the year. Sit back and enjoy this week's ride.

The Mathematics and Multimedia Blog Carnival #6 is now posted at Great Maths Teaching Ideas.

Stephen Wolfram tells, at the Wolfram Blog, about his new venture: Touch Press. I've been waiting for some time for someone to venture beyond the simple ebook to do something more impressive than just providing text to read on an electronic device. Well, Touch Press has done it. Combine text with graphics and live interaction throw in a hefty dose of mathematica under the hood and you have something worth checking out.

It’s a really neat book. There’s something very compelling about being able to spin planets and moons with your finger—and seeing actual spacecraft imagery on all of them. But as I click around exploring the final version of the book, what I’m most struck by is the diversity of innovation in it. Some pages have 3D rotatable objects. Some have computations to run. Some have cutaways revealed by stroking your finger. And yet others have little embedded videos that come to life in a way that nicely complements reading the text. (And of course many pages access Wolfram|Alpha to get detailed, live, astronomical information.)

## New Book: The Best Writing on Mathematics 2010

Princeton University Press just published this book: The Best Writing on Mathematics 2010.

I've not read it so I can't comment on it but it does look interesting.

Amazon has it.

## Wild About Math bloggers 12/24/10

[ The 12/31 article is at Equalis. Here is the previous one. ]

Welcome to the Christmas Eve edition of Wild About Math Bloggers!

I've announced the winner of the TI-84 Plus Silver Edition Giveaway contest. Daniel Chiquito takes the prize. And, he read about the contest at my Equalis Blog!

The Math Teachers at Play Carnival is up at the "Old Math Dog" Learning New Tricks blog.

Peter Rowlett, at "Travels in a Mathematical World" has an interesting discussion of the historical use of "math" vs. "maths." Data for the analysis comes from the Google Books Ngram viewer.