Let H1 & H2 be subgroups of G. How can it be shown that if H1 & H2 have finite index in G then so the intersection of H1 & H2.

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- Sep 18th 2009, 09:37 AMthomas_donaldPoincare's Theorem
Let H1 & H2 be subgroups of G. How can it be shown that if H1 & H2 have finite index in G then so the intersection of H1 & H2.

- Sep 18th 2009, 12:24 PMNonCommAlg