Let a, b ∈ Z, where a ̸ = 0 and b ̸ = 0. Prove that if a | b and b | a, then a = b or a = −b

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answerhappygod
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Let a, b ∈ Z, where a ̸ = 0 and b ̸ = 0. Prove that if a | b and b | a, then a = b or a = −b

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Let a, b ∈ Z, where a ̸ = 0 and b ̸ = 0. Prove that if a | b andb | a, then a = b or a = −b
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