Exercise 5.1.7. Let H and K be subgroups of G. Prove H NK is a subgroup of G. Give an explicit counterexample to show th
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Exercise 5.1.7. Let H and K be subgroups of G. Prove H NK is a subgroup of G. Give an explicit counterexample to show th
Exercise 5.1.7. Let H and K be subgroups of G. Prove H NK is a subgroup of G. Give an explicit counterexample to show that the union of two subgroups is not necessarily a subgroup of G.
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