first, many thanks to Tim Hsu for answering my initial question
on free groups. Now, I have a little problem with the implementation.
Let F be a finitely generated free group and H a finite index subgroup
of F, given by finitely many generators (words in F).
The command FactorCosetOperation(F,H) works well, but what I need
is something like
but NormalClosure(F,H) doesn't work.
What can I do?
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