The word ``book'' has two senses to the ACL2 user. One is the normal one: a sequence of printed paper pages bound together between covers. There are such books about ACL2. Click here for more information.

The other sense is a technical one: an ACL2 ``book'' is a file of definitions, theorems and other commands used to extend ACL2's reasoning abilities. Commands add ``rules'' to ACL2's data base. When a book is ``certified,'' ACL2 checks that all the commands in it can be successfully processed. A book can be ``included'' into an ACL2 session to extend the data base. This is the standard way users exchange useful sets of theorems. See the online documentation topic BOOKS for details.

The standard distribution of ACL2 comes with many books. They are stored on this directory. This is a guide to the available books. We include instructions on how to certify the books in this directory at the end of this note.

Some of the links below are to files. Others are to directories. When
you visit a directory, look at its `README`

file. Most of
these books were written by ACL2 users other than the authors of ACL2.
Authorship is acknowledged in the individual files.

- Makefile: a Unix file for recertifying all the books in this directory.
- Makefile-generic: a Unix file exploited by
`Makefile`

. - Makefile-subdirs: a Unix file exploited by
`Makefile`

. - Makefile-psubdirs: a Unix file exploited by
`Makefile`

. - README: a text file directing you to this file.
- Readme.html: this file.
- add-ons: books which add system-level functionality to ACL2; these should be considered experimental and potentially unsound.
- arithmetic: books about arithmetic. The book
`books/arithmetic/top-with-meta.lisp`

may be the most commonly used ACL2 arithmetic book. See the top of the README file in this directory for a discussion of arithmetic libraries you may want to use, in particular this one or arithmetic-5. Arithmetic is an extraordinarily rich topic and none of our books fully do it justice. If you develop an improved arithmetic book, let us know! - arithmetic-5: books about arithmetic contributed by Robert Krug. The following older libraries are basically superseded by arithmetic-5 (see README files in each directory): arithmetic-2, arithmetic-3, and arithmetic-4. arithmetic-5.
- bdd: books that exercise ACL2's BDD mechanism.
- certify-numbers.lisp: used to
certify the
`cowles`

and`arithmetic`

books when not using make, e.g., for example, when using a Macintosh. - clause-processors: examples of the use of clause processors (e.g., external tools)
- coi: The coi books comprise a "shelf" of ACL2 books related to the modeling of "computational objects" such as processors, memories, kernels, microcode, and so on.
- concurrent-programs: contributions by Sandip Ray (see Readme.lsp files in subdirectories)
- cowles: support for arithmetic books
- data-structures: books for common data structures, with utilities; see also subdirectory memories
- deduction: deduction engine(s)
- defexec: fast execution with mbe and defexec
- defsort:
`defsort`

defines a stable sort when given a comparison function - finite-set-theory: finite sets in ACL2
- fix-cert: update relocated .cert files
- hacking: a library for those who wish to use trust tags to modify or extend core ACL2 behavior
- hints: tests of hints, especially
`:or`

and`:custom`

hints - hons-archive: Implements Hons Archives (HARs), which are a way to write ACL2 objects to disk so they can be loaded in other ACL2 sessions.
- ihs: ``integer hardware specification'', integer arithmetic appropriate for hardware modeling
- make-event: illustrations of
`make-event`

, which implements the idea of macros that can take state - meta: metafunctions for arithmetic
- misc: a grab-bag of useful books and utilities
- models: models, especially of digital systems, with associated proofs
- nonstd: books in support of reasoning about the real
numbers in ACL2 using non-standard analysis. If you want this directory, you will need to
download
the gzipped tar file to your
`acl2-sources/books/`

directory, and then gunzip and extract it there. - ordinals: books about ordinals
- paco: Paco, a cut-down, simplified ACL2-like theorem prover for pedagogical use.
- parallel: example use of primitives for parallelism (with speed-up only in experimental extension that supports parallel evaluation)
- powerlists: a data-structure suited to the analysis of recursive, data-parallel algorithms.
- proofstyles: Soundness and completeness of
different proof strategies used in sequential program verification, along
with (in subdirectory
`invclock`

logical equivalence of two proof styles for verifying programs using operational semantics, namely inductive invariants and clock functions. - quadratic-reciprocity: Gauss's Law of Quadratic Reciprocity
- regex: a regular expression scanner implementation designed to be similar to GNU Grep
- rtl: floating-point arithmetic support, used for example in proofs about AMD rtl
- security: books supporting reasoning about security protocols
- serialize: routines for serializing ACL2 objects to disk
- sorting: correctness and equivalence of several sort algorithms
- str: a rudimentary string library for ACL2
- symbolic: generic proofs of partial and total correctness of sequential programs based on assertional reasoning
- system: checks of invariants on the ACL2 logical world, and verification of termination and guards of some system functions.
- textbook: solutions to the exercises
in
*Computer-Aided Reasoning: An Approach* - tools: macros and tools designed to make common constructs easier and less verbose to write
- tutorial-problems/A>: solutions to exercises of a tutorial nature
- unicode: help for reading input from files
- xdoc: prototype XML documentation system
- workshops: Books in support of ACL2 workshops, as
listed just below. If you want this directory, you will need to
download
the gzipped tar file to your
`acl2-sources/books/`

directory, and then gunzip and extract it there. - workshops/1999: books from ACL2 Workshop 1999, supporting and described
in
*Computer-Aided Reasoning: ACL2 Case Studies*, including full scripts for each case study and answers to all the exercises - workshops/2000: books and papers from ACL2 Workshop 2000
- workshops/2002: books and papers from ACL2 Workshop 2002
- workshops/2003: books and papers from ACL2 Workshop 2003
- workshops/2004: books and papers from ACL2 Workshop 2004
- workshops/2006: books from ACL2 Workshop 2006
- workshops/2007: books from ACL2 Workshop 2007
- workshops/2009: books from ACL2 Workshop 2009

If you seek a book you suspect someone might have created but which is not here, join the ACL2 mailing list and ask the community.

If you develop a book you think will be useful to the community, please submit it following the instructions for contributing books to ACL2.

`make`

process certifies only the basic books. It may
take several hours to certify all the books, but only a couple of hours to
certify only the "basic" books.
All of the instructions below assume that you are standing in subdirectory
`books`

of the ACL2 distribution.

**EXAMPLES:**

To certify the **basic** books, assuming that ``acl2`

' invokes
ACL2, execute:

makeTo certify

`acl2`

' invokes ACL2,
execute the following after you download ```
workshops.tar.gz
```

to your `acl2-sources/books/`

directory,
and then gunzip and extract it there.
make all-plusTo certify the

`my_acl2`

' invokes
ACL2, execute:
make ACL2=my_acl2To certify

`/u/bin/allegro_acl2`

on a Sparc, execute the following. Note that
pathnames of images must be absolute pathnames (except that commands observable
via the Unix path are OK).
make all-plus ACL2=/u/bin/allegro_acl2