Excerpt from The Algebraic Manipulation Package Symbolang: A Manual for Users This manual is intended to fill a long standing gap in the documentation of symbolang. Until now there has been no reasonably detailed reference for users of the package. Past reports have assumed much expertise on the part of the reader. We are probably guilty of the same sin, but hopefully to a lesser extent. Old hands at symbolang will note that there have been major changes made. Functions of an arbitrary number of variables are now allowed. Expressions may appear as exponents, instead of exponents being restricted to constants. List space is conserved by allowing expressions to share common subexpressions. Evaluation and substitution have been combined and generalized. Most of the old routines are declared unfit for new code, and a bunch of strangers have taken their place. Yet, despite the brief flirtation with the name sym866, we still call the package symbolang. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.