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# The GAP 4 package 'IdRel'
## Introduction
The 'IdRel' package is designed for computing the identities among relations
of a group presentation using rewriting, logged rewriting,
monoid polynomials, module polynomials and Y-sequences.
## History
Version 1.001 of 'IdRel' formed part of Anne Heyworth's PhD thesis in
December 1999.
Version 2.02 was prepared for the GAP 4.4 release in March 2006
and deposited in the incoming directory on the St Andrews ftp server.
A more detailed history will be included as Chapter 6 of the manual.
'IdRel' became an accepted package in May 2015.
## Distribution
The 'IdRel' package is distributed with the accepted GAP packages.
It may also be obtained from the GitHub repository at:
<https://gap-packages.github.io/idrel/>
## Copyright
The 'IdRel' package is Copyright © Chris Wensley and Anne Heyworth,
1999--2025.
'IdRel' is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
For details, see <https://www.gnu.org/licenses/gpl.html>.
## Installation
* Unpack `idrel-<version_number>.tar.gz` in the `pkg` subdirectory
of the GAP root directory.
* From within GAP load the package with:
```
gap> LoadPackage("idrel");
true
```
* The documentation is in the `doc` subdirectory.
* To run the test file read `testall.g` from the `idrel/tst/` directory.
## Contact
If you have a question relating to 'IdRel', encounter any problems,
or have a suggestion for extending the package in any way, please
* email: <mailto:cdwensley.maths@btinternet.com>
* or report an issue at the GitHub issue tracker:
<https://github.com/gap-packages/idrel/issues/new>
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2026-03-28
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