[GAP Forum] forwarded message from Rudolf Zlabinger re PREFAG

[John McDermott]

From: "Rudolf Zlabinger" <Rudolf.Zlabinger at chello.at>
Date: 8 June 2007 17:08:26 BDT
To: "GAP Forum" <forum at gap-system.org>
Cc: <support at gap-system.org>
Subject: package PREFAG


Dear Forum,

while the original message, with the package attached, is hold for  
size reasons (48KB, limit 40KB) I am allowed in the meantime to  
preannounce a rewritten package PREFAG 1.0.3 without the package  
attached.

PREFAG stands for PRoducts and Exact FActorizations for Groups and  
gives exact factor groups of a given group and calculates external  
products including ZS - Products (where none of the embedded factor  
subgroups are normal in the product). Some help functions are also  
included.

PREFAG 1.0.3 is a rewritten package, that adds valuable performance  
options to the original version. The factorization functions can be  
used now for AllSmalGroups, and, for special cases also above. The  
external product function can be used now up to a product size of  
about 100.000.

As I unfortunately at the moment cannot maintain a homepage, the  
package now is distributed by mail on demand basis. If you are  
interested on the package, please send me a mail, I will send you an  
answer with the package attached. Later on the package will be  
deposited at the GAP homepage at level 1.0.3 and will be available  
from there. A formal acceptance procedure (refereeing) is also  
already initiated. It may be, that the usage of the package is for  
now restricted to Windows users, for the compress format *.zip and  
for readable documentation, I will supply formats for the other  
platforms as soon as possible.

best regards, Rudolf Zlabinger

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--
John McDermott
Scientific Officer
Centre for Interdisciplinary Research in Computational Algebra
School of Computer Science
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