In section 36.8 of the GAP4 manual says that "For element
operations such as in, a double coset behaves like a set of group
elements".

But when I try to take the union or intersection of a DoubleCoset
with a Set of group elements, GAP4 can't do it! It enters the break
loop...

How can I (easily) take these unions and intersections??

Yours, Mike H...

Michael Hartley : Michael.Hartley@sit.edu.my
Head, Department of Information Technology,
Sepang Institute of Technology
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"If you entertain a thought, it becomes an attitude..."

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