In this article, we introduce a category of *weak Lie 3-algebras* with suitable *weak morphisms*. The definition is based on the construction of a partial resolution over $\mathbb{Z}$ of the Koszul dual cooperad $\text{Lie}^\text{¡}$ of the $\text{Lie}$ operad, with free symmetric group action. Weak Lie 3-algebras and their morphisms are then defined via the usual operadic approach—as solutions to Maurer–Cartan equations. As 2-term truncations we recover Roytenberg’s category of *weak Lie 2-algebras*. We prove a version of the *homotopy transfer theorem* for weak Lie 3-algebras. A right homotopy inverse to the resolution is constructed and leads to a *skew-symmetrization construction* from weak Lie 3-algebras to 3-term $\textrm{L}_\infty$-algebras. Finally, we give two applications: the first is an extension of a result of Rogers comparing algebraic structures related to $n$-plectic manifolds; the second is the construction of a weak Lie 3-algebra associated to an LWX 2-algebroid leading to a new proof of a result of Liu–Sheng.

Type

Publication

Preprint

Date

August, 2017