
				 IMPS

			     Version 1.1

	    Copyright (c) 1990-1994 The MITRE Corporation

	  Authors: W. M. Farmer, J. D. Guttman, F. J. Thayer


Contents:

   A. Introduction
   B. IMPS Mailing List
   C. How to Get IMPS
   D. How to Install IMPS
   E. Instructions for IMPS Users
   F. How to Start IMPS
   G. The IMPS Manual
   H. IMPS Papers
   I. Bug Reports and Questions
   J. Acknowledgments


A. Introduction

IMPS is an Interactive Mathematical Proof System developed at The
MITRE Corporation.  The IMPS system is available via ftp under the
terms of a public license (see section C below).  IMPS runs under the
X Window System or OpenWindows on Sun 4 SPARCstations that have at
least 24 MB physical memory (preferably more) and at least a 60 MB
swap partition.

IMPS is intended to provide organizational and computational support
for the traditional techniques of mathematical reasoning.  In
particular, the logic of IMPS allows functions to be partial and terms
to be undefined.  The system consists of a database of mathematics
(represented as a network of axiomatic theories linked by theory
interpretations) and a collection of tools for exploring, applying,
extending, and communicating the mathematics in the database.  One of
the chief tools is a facility for developing formal proofs.  In
contrast to the formal proofs described in logic textbooks, IMPS
proofs are a blend of computation and high-level inference.
Consequently, they resemble intelligible informal proofs, but unlike
informal proofs, all details of an IMPS proof are machine checked.


B. IMPS Mailing List


To subscribe to the IMPS mailing list, send your name and e-mail
address to

   imps-request@linus.mitre.org

We strongly urge that all users of IMPS subscribe to the IMPS mailing
list.


C. How to Get IMPS

Ftp to math.harvard.edu, login as "anonymous", and give your e-mail
address as the password.  Then type

   cd imps

The directory you will be in contains a directory named doc and four
files:

   1. this file (README),

   2. the IMPS system (imps.tar.gz),

   3. the IMPS manual (imps-manual.dvi.gz), and 

   4. the IMPS public license (public-license).

The IMPS manual and public license are also included in the IMPS system.
To get a copy of the IMPS system, type

   binary
   get README
   get imps.tar.gz

The transfer will take a few minutes.


D. How to Install IMPS

1.  Create a directory called imps (or whatever you prefer) somewhere
in your file system where you have 35-40 MB free.  (About 20 MB of
this space is for IMPS; the rest is needed only during installation.)
Let us refer to this directory as /.../imps.  Execute (the shell
command)

    cd /.../imps

2.  Copy the file imps.tar.gz to the /.../imps directory.  Then execute
the following commands

   gunzip imps.tar.gz
   tar -xvf imps.tar

Each of these operations will take several minutes.  After they are
done, you may delete the file imps.tar or recompress it and put it
somewhere else.

3. Choose the version of Emacs you want to use with IMPS.  The
preferred version is Free Software Foundation GNU Emacs 19, but we
also support GNU Emacs 18 and Lucid GNU Emacs 19.  If you will be
using Free Software Foundation GNU Emacs 19 or Lucid GNU Emacs 19, put
the line

   (setq tea-use-comint t)

in your .emacs file.  Let us refer to the location of the Emacs
executable as /.../emacs.

Warning: Depending on the version of Emacs you choose, you may have to
recompile the .el files in the directory

   /.../imps/el

4. Execute 

   cd /.../imps/src

and edit the file start_imps.sh to change the two lines

   IMPS=<imps-path>/tea
   IMPS_EMACS=<emacs-path>

to 

   IMPS=/.../imps/tea
   IMPS_EMACS=/.../emacs

Finally, execute

   make

(You may ignore the error messages that are printed.)


E. Instructions for IMPS Users

In your .cshrc (or wherever you define your shell search path) add
/.../imps/bin to your path.  You may find it convenient to set the
shell variable IMPS in your .cshrc using the command

   setenv IMPS /.../imps/tea

If you want a form of Emacs different than /.../emacs, the official
IMPS Emacs, set the shell variable EMACS_COMMAND in your .cshrc to the
form of Emacs you want; for example,

   setenv EMACS_COMMAND 'emacs18 -w 94x56+250+20'

If you will be using Free Software Foundation GNU Emacs 19 or Lucid
GNU Emacs 19, put the line

   (setq tea-use-comint t)

in your .emacs file.  

If IMPS is being run with Free Software Foundation GNU Emacs 19, the
frame parameters (position, background and foreground colors,
etc.) of the various IMPS windows are specified in the file

   /.../imps/el/frame-specs.el

You will probably want to modify these specifications to suit your own
taste.  To do this, first copy the file frame-specs.el to 

  /.../home/imps/imps-emacs.el

(where /.../home is your home directory and imps is a subdirectory of
your home directory that is created when you first run IMPS).  Then
change the frame specifications in this file as you like.

To subscribe to the IMPS mailing list, send your name and e-mail
address to

   imps-request@linus.mitre.org


F. How to Start IMPS

To run IMPS, start X or OpenWindows, and then execute

   start_imps &


G. The IMPS User's Manual

The IMPS user's manual is written in LaTeX and is available on-line.
The .dvi file of the manual is located in the directory

   /.../imps/doc/manual

(Also, both .dvi and .ps files of the manual are located in the imps
directory at math.harvard.edu.)  The manual is approximately 300 pages
long.


H. IMPS Papers

In the imps/doc directory at math.harvard.edu, there are several
papers on IMPS in compressed LaTeX dvi and ps formats.


I. Bug Reports and Questions

Please mail information about bugs or problems with using IMPS to 

   imps-bugs@linus.mitre.org

Other questions can be mailed to 

   imps-request@linus.mitre.org


J. Acknowledgments

IMPS was designed and developed at The MITRE Corporation under the
MITRE-Sponsored Research program.  Ronald D. Haggarty, Vice President
of Research and Technology, deserves special thanks for his strong,
unwavering support of the IMPS project.

Several of the key ideas behind IMPS were originally developed by
Dr. Leonard Monk on the Heuristics Research Project, also funded by
MITRE-Sponsored Research, during 1984-1987.

We are grateful to the Harvard Mathematics Department for providing an
ftp site for IMPS.

The IMPS core and support machinery are written in the T programming
language, developed at Yale by N. Adams, R.  Kelsey, D. Kranz, J.
Philbin, and J. Rees.  The IMPS user interface is written in the GNU
Emacs programming language, developed by R. Stallman.
