L. Breen

activity

19982001

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math.CT1998

Braided n-categories and $Σ$ -structures

Lawrence Breen

We associate to a braided 2-stack $C$ a torsor, endowed with a symmetric cube structure (or $Σ$ -structure), whose triviality is equivalent to the existence on $C$ of…

math.CT1998

Monoidal categories and multiextensions

Lawrence Breen

We show that the obstruction to the existence of a strict symmetric monoidal structure on a monoidal stack $C$ is determined by a commutator biextension associated to $C$ …

Braided n-categories and Σ-structures

Monoidal categories and multiextensions

Braided n-categories and $Σ$ -structures