Abstract Algebra: Theory and Applications · Problem 11.5.7

Matrix Groups and Symmetry — Thomas Judson

Mathematics — Abstract Algebra · automorphisms-of-integers

Problem

Find all of the homomorphisms ϕ:Z→Z\phi : \mathbb{Z} \to \mathbb{Z}. What is Aut(Z)\text{Aut}(\mathbb{Z})?

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