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
Posted: Wed May 11, 2022 4:54 am
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.