# Mathematical Digest

### Short Summaries of Articles about Mathematics

in the Popular Press

"Square Knots" by Brian Hayes. *American Scientist*, November-December 1997, pages 506-510.

Mathematicians have always been fascinated by the under- and over-weavings of knots. A mathematical knot is a closed loop that may simply be a circle (called the "unknot") or that may cross under and over itself any number of times to form a knot that cannot be untied except by cutting the loop. An open question in this field of study is how to devise a method of determining when two knots are the same. This article describes a way of representing knots on a computer and discusses efforts to use these representations to answer mathematical questions about knots. These efforts show that the complex world of knots easily overwhelms computational attempts to catalogue them.

*--- Allyn Jackson*