Let G be a group and let p be a prime number such that pg = 0 for every element g ∈ G.
a. If G is commutative under multiplication, show that the mapping
f : G → G
f(x) = xp
is a homomorphism
b. If G is an Abelian group under addition, show that the mapping
f : G → G
f(x) = xpis a homomorphism.
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