[GAP Forum] Numbering of primitive groups

pjc at mcs.st-and.ac.uk pjc at mcs.st-and.ac.uk
Tue Aug 27 11:06:58 BST 2013


Dear Forum,

Akos Seress, in Bull. London Math. Soc. 29 (1997), 697-704, listed all the
(finitely many) primitive groups which have no regular orbit on the power
set of their domain. He listed them by GAP number and ATLAS name.

Sad to say, the GAP numbering seems to have changed since then. For
example, Akos thought PrimitiveGroup(16,19) is 2^4.A_7, whereas GAP now
thinks this group is 2^4.A_5.

I have two questions:
1. Does anyone have a list correlating the old and new numbers? I think
that, from the ATLAS names, I can recover what he meant, but it would be
nice to have a check.

2. Is there any way that we can draw the group-theory community's
attention to this, perhaps with an updated list?

Peter.




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