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Subject: Centres
From: mark.longridge@canrem.com (Mark Longridge)
Message-Id: <60.932.5834.0C1C6CAC@canrem.com>
Date: Tue, 3 Jan 1995 00:05:00 -0500
Organization: CRS Online  (Toronto, Ontario)

Jerry Bryan asks:

>      ... doesn't the center of GE (and of G) in fact consist
> of more than just the Superflip and the identity?  Does it
> not also include the Pons Asinorum and the composition of
> the Pons Asinorum and the Superflip?

Hmmm, I don't think so...

 The centre commutes with every process, and the Pons Asinorum
just doesn't.

E.g.   R1 + F2 B2 U2 D2 L2 R2  <>  F2 B2 U2 D2 L2 R2 + R1


I think Martin has scoped out all the possible centres in other
subgroups.

-> Mark <-