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Dear Forum,

I have explicitly given a finitely generated

(non-abelian) free group G,

a finite index subgroup H,

and a finite index normal subgroup of H, called N.

(N is is in general not normal in G.)

(H and N are given as finitely generated subgroups of G).

Now my question:

Can GAP check if the intersection of H with

the normal closure of N in G is equal to N?

Thanks

Phil

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