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Perhaps this is a "newbie" question:

Today after a long computation (I let it run overnight) I

obtained a particular sought-after subgroup of a general linear

group over a finite field, say GL(3,7). I needed to study

properties of the center of this group G, and carfully defined

Z := Centre(G). Much to my surprise everything broke down, since

Z is evidently an "internal" function used in conjunction with

finite fields.

After making such a blunder, is there any way to recover

the original definition of the internal function Z?

Thanks,

--Walter

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