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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>