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    Subgroup proofs

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    Let G be a group, not necessarily finite, and let H be subgroup G.
    (a) Prove that U = intersection of all x in G xHx^-1 is the largest
    normal subgroup of G contained in H.
    (b) Show that no proper subgroup H of A_5 contains six distinct Sylow

    I need a detailed rigorous proof of this to study please.

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    Solution Preview

    If N is a normal subgroup of G contained in H, then the intersection of all the conjugates of N in G is contained in the intersection of all the ...

    Solution Summary

    This provides an example of completing a proof about the largest normal subgroup in a group and Sylow 5-subgroups.