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    Post Closed as "too localized" by Igor Rivin, Qiaochu Yuan, Dmitri Pavlov, HW, AndrĂ© Henriques

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Comutatividade Commutativity of the fundamental group of any Lie Group

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Comutatividade of the fundamental group of any Lie Group

How do we formally prove that the fundamental group of any Lie group is always commutative?