Prove equivalence
Fix an integer n ≥ 2. Define the relation ≡ on the integers via a ≡ b(mod n) (where a, b ∈ Z) if and only if n|(a - b). Prove that ≡ is an equivalence relation on the integers. prove equivalence relation, is it be a≡b? what we should prove?
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Induces a surjective homomorphism of fundamental groups.
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Prove equivalence relation
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