XY-pic User’s Guide
Kristoffer H. Rose · 1999
XY-pic is a package for typesetting graphs and diagrams using Knuth's TEX typesetting system. XY-pic works with most of the many formats available; e.g., plain TEX, LATEX, and AMS-TEX. Several styles of input for various diagram types are supported; they all share a mnemonic notation based on the logical composition of visual com-ponents. This guide concentrates on how to typeset \\matrix-like " diagrams, such as commutative diagrams, in the following style: U y