Dear Forum,

> On Mar 2, 2015, at 3/2/15 3:35, Anvita <> wrote:

> Suppose G is a matrix group. What would be
> an efficient way to find the subgroup of G that
> consists of scalar matrices? I have not found
> a suitable function in GAP. Of course, it is
> a subgroup of the centre of G, but it can be
> much smaller than that.

In the cases I have worked with, getting the centre, and then if necessary 
testing membership of scalar matrices (i.e. subgroups of F*) in the centre 
would have worked without problems. What dimension, what fields are you looking 


   Alexander Hulpke

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