The answers to exercises marked IBB] can be found in the Back of the Book.
[BB] For a, b ∈R, define a ~ b if and only if a − b ∈ Z.
(a) Prove that ~ defines an equivalence relation on Z.
(b) What is the equivalence class of 5? What is the equivalence class of ?
(c) What is the quotient set determined by this equivalence relation?
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