ACL2 Version 4.3
ACL2 is part of the Boyer-Moore family of provers, for which its authors have received the 2005 ACM Software System Award.
|Start Here: Applications, Tours, and Tutorials/Demos||ACL2 Workshops and UT ACL2 Seminar|
|Books and Papers about ACL2 and Its Applications||The User's Manual and Hyper-Card|
|Lemma Libraries and Utilities||Mailing Lists|
|Recent changes to this page||Obtaining and Installing Version 4.3|
|Differences from Version 4.2||Other Releases|
|How to contribute libraries and documentation|
The distribution also includes libraries of books (files
containing definitions and theorems) that extend the code that we have
written. Books are contributed and maintained by the ACL2 community
and their authors are generally noted in each book or its
Another extension of ACL2 is the Eclipse-based ACL2 Sedan (ACL2s). Unlike the systems above, ACL2s is distributed and maintained by Pete Manolios and his research group. ACL2s comes with a standard executable ACL2 image for Windows, but it also comes with pre-certified books and an extension of ACL2 with additional features, including extra automation for termination proofs as well as counterexample generation.
Here are the two common entries to the documentation graph:
|Major Topics (Table of Contents)|
|Index of all documented topics|
Here is how we recommend you use this documentation.
If you are a newcomer to ACL2, we do not recommend that you wander off into the full documentation. Instead start with the ACL2-TUTORIAL documentation topic. Experienced users tend mostly to use the ``Index'' to look up concepts mentioned in error messages or vaguely remembered from their past experiences with ACL2.
Note: The documentation is available for reading in a Web
browser (recommended), in Emacs Info, using the ACL2
or as a printed book (about 1900 pages). These are available as follows.
xdoc/manual/preview.html. Better yet, view a local copy of this file found under your
acl2-sources/books/directory, if you have certified your distributed books. If you use the experimental HONS version of ACL2 then you can build a more complete manual in
make regression-hons-fresh ACL2=<path to your saved_acl2>
emacs/emacs-acl2.eldistributed with ACL2 (under the
acl2-sourcesdirecotry), and then evaluating
meta-x acl2-info. Alternatively, within Emacs Info press
gand then enter the following path (of course, replacing
PATH_TO_ACL2-SOURCESby the path of your
workshops'') and non-standard analysis (``
We strongly encourage users to submit additional books by following the instructions for contributing books to ACL2.
We also distribute a few interface
tools, such as support for infix printing. For these, see the Utilities
Books and Papers about ACL2 and Its Applications. Some of the
papers mentioned in that collection contain utilities, scripts, or
ACL2 books the problem domains in question.
Also, if you have written up (or are interested in writing) text that
may be helpful to other ACL2 users, we invite you to contribute it to
the community. Such user documentation may be in any format that is
readable by web browsers (for example html, pdf, and plain text).
User-contributed documentation can link back to the ACL2 documentation
proper, by using links such as:
(In general, substitute the upper-case of the documentation topic for "
MAKE-EVENT" in the example above.)
To contribute user documentation, send email to the ACL2 developers,
for example at