> < ^ Date: Tue, 27 May 1997 16:33:34 +0100
> < ^ From: Jean Michel <jmichel@math.jussieu.fr >
^ Subject: Bugfix for CHEVIE

Dear GAP-Forum,

This is to announce a bugfix for the CHEVIE share package. The priority
of this fix is high if you are using the CHEVIE package.

It fixes minor bugs with the usage of reflection subgroups in
conjunction with braids or hecke elements. It also fixes serious
problems with the computation of Kazhdan-Lusztig polynomials which
in the distributed version fails for reflection subgroups and
Kazhdan-Lusztig bases which in the distributed version fail
when a mu coefficient is not equal to 1.

To apply the fix, load the zoo archive 'fix1.zoo' from the
bugfixes web page
Alternatively you can find this file in the 'bugfixes' directory of the
GAP ftp distribution.

Unpack the file in the home directory of your GAP distribution (the
directory containing the 'lib' and 'etc' directories) using 'unzoo'. This
will replace the erraneous files by fixed versions.

You won't need to recompile anything.

Best regards,


P.S. And my thanks to Alexander Hulpke who helped me prepare this bugfix!

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