Question
Find Aut( Z 15 ). Use the Fundamental Theorem of Abelian Groups to express this group as an external direct product of cyclic groups of
Find Aut( Z15). Use the Fundamental Theorem of Abelian Groups to express this group as an
external direct product of cyclic groups of prime power order.
This is what I have so far but am not 100% sure it's correct or sure if it's justified properly
Aut(Z15) = U(15) = U(5) + U(3) =Z(4) + Z(2)
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An Introduction to the Mathematics of Financial Derivatives
Authors: Ali Hirsa, Salih N. Neftci
3rd edition
012384682X, 978-0123846822
