Operads as polynomial 2-monads

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• Mark Weber (Macquarie University)
• Tuesday 26 April 2016, 14:15-15:15
• MR5, Centre for Mathematical Sciences.

If you have a question about this talk, please contact Dr Ignacio Lopez Franco.

In this talk the construction of a polynomial 2-monad from an operad is given which is different from the standard construction of a monad from an operad, in that the algebras of our associated 2-monad are categorified algebras of the original operad. In this way one can characterise operads and clubs as categorical polynomial monads in a canonical way. The standard construction of a monad from an operad is recovered in a 2-categorical way from our associated 2-monad, and one can understand the Set-valued algebras of both as weak morphisms of operads into a Cat-operad of categories. Algebras of operads within general symmetric monoidal categories are easily expressed in our framework, and the associated PROP of an operad is recovered as a codescent object from the polynomial 2-monad data. For a sigma-free operad, we establish a Quillen equivalence with respect to the Lack model structures, between the strict algebras of our associated 2-monad, and those of the standard one.

This talk is part of the Category Theory Seminar series.

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