The cover shows *Red Sea Pearls* by Radmila Sazdanović.

The electronic version of the latest issue of the Girls’ Angle Bulletin is now available on our website.

The cover features *Red Sea Pearls*, by Radmila Sazdanović, a postdoctoral fellow in mathematics at the University of Pennsylvania. You can also check out the WIM video she did presenting an interesting geometric problem. We continue to try to encourage people to subscribe to our print version, so we have removed most of this interview, as well as Part 2 of the Stable Marriage Algorithm and Coach Barb’s Corner from the electronic version of the Bulletin. Subscriptions are a great way to support Girls’ Angle while getting something concrete back in return.

In this interview, Radmila makes the strong case that mathematics is an art. It takes a lot of creativity to invent new math. Unfortunately, math seems to have a reputation for being cut and dry. To help counter this, toward the end of this issue, there is a set of 8 problems collected under the title *Invent!* These problems are math problems where two people are very likely to come up with completely different, yet valid solutions. Each problem admits multiple solutions.

Detail from illustration by Julia Zimmerman

for the Stable Marriage Algorithm Part 2

Julia Zimmerman magnificently illustrates the Stable Marriage Algorithm using a comic script written by Larry Guth, Grace Lyo, Amy Pasternak, Elizabeth Wood, and Julia Zimmerman. They took the example Emily Riehl used in Part 1 of this series and turned it into a story full of romance, intrigue, and back-stabbing! Keep an eye out for Part 3 in the next issue. This work and Robert Donley’s series on Fermat’s little theorem are supported in part by a generous grant from MathWorks.

A cone inscribed in a square pyramid.

Taotao and I write about basic properties of cones in Math in Your World and a separate article on the volume of a cone. This story touches on curvature, Cavalieri’s principle, calculus, and Hilbert’s 3rd problem and can serve as a launch point for investigating each of these topics in greater depth.

Robert Donley, aka Math Doctor Bob, delves more deeply into Fermat’s little theorem, providing a non-inductive proof of the result. (In the previous issue, he gave an inductive proof utilizing the binomial theorem and properties of Pascal’s triangle.)

Coach Barb’s inimitable character 3/7s returns to lay down the wisdom on average speed.

Also, if you like cracking secret codes, there’s one for you at the back of Notes from the Club. Good luck and Happy New Year!

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