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answer clarified; added 1 characters in body

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edited Dec 19, 2009 at 2:58

Chris Schommer-Pries

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This is Proposition 1 in the seminal paper "Braided Monoidal Categories" by Joyal and Street. Relation (ii) is implied by the others.

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created Dec 18, 2009 at 23:39

Chris Schommer-Pries

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This is Proposition 1 in the seminal paper "Braided Monoidal Categories" by Joyal and Street.