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Let G be a group of order p^k(p prime, k > 0)
(a)Prove that G has a non-trivial centre (hint: use the class equation)
(b)Prove that G has a normal subgroup of order p^m for all m < k
Hint: You may use the following intermediate steps:1. Prove that for any group G, any subgroup of the centre Z(G) is normal in G2. Use the above and the rst part to nd a normal subgroup H of order p3. Use induction on k to nd normal subgroups of G=H4. Prove that for any group homomorphism p : G ! H and any normal subgroup K of H, p(-1)(K)is normal in G
(c)Prove that any group of order p^2 is Abelian
Use Method of undetermined coefficient to find a particular solution. Then write the general solution.
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