**NAME**

derivations - book: Derivations of Applied Mathematics

**DESCRIPTION**

Understandably, program sources rarely derive the mathematical formulas
they use. Not wishing to take the formulas on faith, a user might
nevertheless reasonably wish to see such formulas somewhere derived.
__Derivations__ __of__ __Applied__ __Mathematics__ is a book which documents and
derives many of the mathematical formulas and methods implemented in
free software or used in science and engineering generally. It
documents and derives the Taylor series (used to calculate
trigonometrics), the Newton-Raphson method (used to calculate square
roots), the Pythagorean theorem (used to calculate distances) and many
others.

**READING** **THE** **BOOK**

Among other ways, you can read the book on your computer screen by
opening the file __/usr/share/doc/derivations/derivations.ps.gz__ with the
**gv**(1) program under **X**(7). To print the book on a standard postscript
printer, just **zcat**(1) then **lpr**(1) the same file.

**FILES**

__/usr/share/doc/derivations/derivations.ps.gz__
the book in postscript format
__/usr/share/doc/derivations/derivations.pdf.gz__
the book in PDF

**BUGS**

The book is a work in progress.

**AUTHOR**

The book and this manpage are written by Thaddeus H. Black, who also
maintains the Debian package __derivations__ in which they are distributed.
Users who need to contact the author in his role as Debian package
maintainer can reach him at <thb@debian.org>. However, most e-mail
will naturally be about the book itself: this should be sent to
<thb@derivations.org>.

**COPYLEFT**

Copyright (C) 1983-2010 Thaddeus H. Black.
The book, this manpage and the entire __derivations__ distribution are free
software. You can redistribute them and/or modify them under the terms
of the GNU General Public License, version 2.

**SEE ALSO**

**gv**(1) [__gv__], **zcat**(1) [__gzip__], **psselect**(1) [__psutils__], **lpr**(1) [__lpr__],
**octave**(1) [__octave__]