(Abstract Algebra 1) The Identity Function
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(Abstract Algebra 1) Invertible Functions
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(Abstract Algebra 1) Determining if a Function is Invertible
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Isomorphic Groups and Isomorphisms in Group Theory | Abstract Algebra
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Characteristics of the Identity Function
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(Abstract Algebra 1) Definition of a Group
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Proof: Composition of Injective Functions is Injective | Functions and Relations
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(Abstract Algebra 1) Units Modulo n
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