Xy-pic User's Guide

## 4.4 Credits

Xy-pic version 2 was a small package created by the author. The present version 3.3 is the result of more than three years of continued collaboration with Ross Moore, and would never have been developed without his support and TeX-nical expertise. This includes many of the modes mentioned above which were created for use within specialised branches of mathematics, however, the notations are designed to fit quite naturally within the framework of Xy-pic and are useful more generally.

Xy-pic User's Guide