The typesetting in mathematics, science, and engineering is standardized by the software program TEX, developed by Donald E. Knuth.

This text serves as a reference for the TeX typesetting system. It is helpful for those who wish to create LaTeX macros and other TeX modifications.

TeX By Topic is a priceless tool for every TeX user who wants to learn how to create challenging macros on their own. The book includes in-depth descriptions of the mechanisms underlying each TeX macro in addition to a wealth of very innovative, valuable, and practical ideas. contains a comprehensive cross-referencing mechanism.