> < ^ From:

^ Subject:

Dear Gap-Forum,

We have been alerted by Christian Pech, that there are groups missing from

the primitive groups library. This library was compiled (largely by hand) as

part of a PhD thesis, and -- as far as we can see at the moment -- some

groups of nonsolvable affine type got lost in this classification.

Consequentially, we have done further tests. At the moment we are aware of

missing groups at least in degrees 5^3,11^2,13^2.

The missing groups of degree 13^2 are solvable and are also missing in the

library of irreducible solvable groups.

We will add all missing groups we are aware of in the next release.

(Let me stress, that these are ommissions in a hand-classification which

subsequentially was made available as a data base. This is not due to a bug

in GAP or another computer program.

Also at the moment the primitive groups library beyond degree 50 is not used

by any other GAP function. Unless you have done calculations which assume

completeness of the list -- something we did not guarantee -- the only

no effect on GAP calculations that do not use the primitive groups library.)

We eventually aim to redo the incorrect classification to be able to

provide a complete list. However this is a nontrivial task and will take

longer than the usual span for bugfixes:

Until further information is given, consider the list

of primitive groups beyond degree 50 to be incomplete.

(The warranties given with the restructuring for release 4.2 for this

library, namely that the groups are ``stable'' (i.e. the same index gives

the same group) and that all groups in this library are different are not

affected.)

I apologize for this problem. If you use the list of primitive groups in

your work, and aim to get a complete list of groups of a certain degree,

please contact us, and we will give you a more detailed status of the data

as soon as we have finished the current tests.

Best wishes,

Alexander Hulpke

-- Colorado State University, Department of Mathematics,

Weber Building, Fort Collins, CO 80523, USA

email: hulpke@math.colostate.edu, Phone: ++1-970-4914288

> < [top]