> < ^ Date: Thu, 20 Jul 2000 11:43:11 +0100
> < ^ From: Willem de Graaf <degraaf@math.uu.nl >
^ Subject: bugfix #4 for GAP4.2

Dear Forum,

This is to announce bugfix number 4 for GAP 4.2. The priority of this fix
is high.

You should not apply this fix to any version of GAP3, nor to any
version of GAP4.1.

This fix corrects:
1) a problem with the \in' method for equivalence relations,
2) a problem with IsReesCongruence',
3) a problem with NormalIntersection',
4) a problem with calculating irreducible characters,
5) a problem with calculating preimages of group homomorphisms,
6) a problem with the help system.

Errors 1), 2), 5) may cause GAP to produce wrong results.
We note that they also occur in GAP4.1.

Errors 3), 4), 6) may cause GAP to signal an error.

Many thanks to:
Robert Morse for reporting and fixing error 1),
Isabel Araujo for reporting and fixing error 2),
Andy Tonks for reporting error 3),
Leonard Soicher for reporting errors 5) and 6).

Installing the bugfix.
======================


Load the zoo archive fix4r2n4.zoo' from the bugfixes web page
http://www-gap.dcs.st-and.ac.uk/~gap/Info4/bugfixes.html
Alternatively you can find this file in the bugfixes' directory of the
GAP4 ftp distribution.

Unpack the file in the home directory of your GAP distribution (the
directory containing the lib' and grp' directories) using unzoo -x
fix4r2n4.zoo'. unzoo' may ask you for permissions to overwrite files,
answer this with Y)es or A)ll. This will replace the erroneous files by
fixed versions.

(On a PC or a Mac you will have to copy unzoo' in the same directory and
enter the argument line after the call to unzoo'.)
Make sure you have write permissions when applying the fix.

This fix does not change the kernel. Therefore you do *not* have to recompile.

You can remove the file description4' afterwards.

After installing the bugfix you can test whether
the bugfix has been applied correctly by starting GAP from the gap4r2'
directory and issuing

Willem de Graaf, 20-July-00
`