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can someone please tell me the name Name of the marshall hall Marshall Hall paper in which he proved that the intersection of all subgroups of a fixed finite index is again finite index?

can someone please tell me? I couldn't find a reference in the paper I was reading.

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can someone please tell me the name of the marshall hall paper in which he proved that the intersection of all subgroups of a fixed finite index is again finite index?

I couldn't find a reference in the paper I was reading.