Other

## Ivars Peterson's Articles

- Feature
## Games Theory

Online games can not only entertain but also provide valuable data for researchers tackling computer-vision and other tough computational problems. - Math Trek
## The Complexity of TipOver and Other Puzzles

Solving puzzles such as TipOver and River Crossing can be surprisingly difficult. - Math Trek
## Divide-and-Conquer Multiplication

The most efficient way to multiply two large numbers is often far from obvious. - Math Trek
## Sudoku Class

Sudoku puzzles are showing up in the math classroom. - Math Trek
## Knitting Network

A skein of intriguing mathematical objects comes out of an evening devoted to knitting, crocheting, and other crafts. - Math Trek
## A Polyhedron with a Hole

A polyhedron with seven faces, 14 vertexes, 21 edges, and a hole makes an intriguing lamp. - Math Trek
## Art of the Tetrahedron, Revisited

A New Orleans sculptor and his tetrahedron-based artworks survived Hurricane Katrina. - Math Trek
## Laying Track

Switches in train track layouts lead to a tangled math problem. - Math Trek
## The Coin in the Cake

Hiding a coin in a cake offers a lucky slice and a tantalizing math problem. - Math Trek
## Rankings, Tournaments, and Playoffs

All outcome-based sports ranking systems are fundamentally flawed.