See Centralizer in the on-line help.
Steve
> On 15 May 2015, at 12:06, abdulhakeem alayiwola <lovepgro...@gmail.com> wrote:
>
> Dear forum,
> If B is a subgroup of a group A and i wish to define a function such that
> i get only the elements of A that commutes with all elements of B. how can
> this be done using GAP.
> Thanks.
> Best regards.
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