Metatheory - University of Cambridge

In 2005, P.D. Magnus released the first version of his open-source logic textbook,
forallx. In 2012, Tim Button adapted this for a first-year course at the
University of Cambridge. Metatheory takes up exactly where the Cambridge
implementation of forallx leaves off. Tim would, once again, like to thank
Magnus for making forallx freely available. With this in mind, Metatheory
is released under the same open-source license as forallx. Tim would also like
to thank Brian King for comments and corrections.
© 2013 by Tim Button. Some rights reserved. This book is offered under a
Creative Commons license (Attribution-ShareAlike 3.0).
You are free to copy this book, to distribute it, to display it, and to make derivative works,
under the following conditions: (a) Attribution. You must give the original author credit.
(b) Share Alike. If you alter, transform, or build upon this work, you may distribute the
resulting work only under a license identical to this one. — For any reuse or distribution,
you must make clear to others the license terms of this work. Any of these conditions can be
waived if you get permission from the copyright holder. Your fair use and other rights are
in no way affected by the above. — This is a human-readable summary of the full license,
which is available on-line at http://creativecommons.org/licenses/by-sa/3.0/
Typesetting was carried out entirely in L A TEX2ε. The style for typesetting
proofs employs forallx.sty by P.D. Magnus, University at Albany, State University
of New York; Magnus’s file is based upon fitch.sty (v0.4) by Peter
Selinger, University of Ottawa.