The Long-Moody construction and polynomial functors ,
The Long-Moody construction and polynomial functors ,
The Long-Moody construction and polynomial functors ,
Computations of stable homology with twisted coefficients for mapping class groups ,
, This section recollects Quillen's bracket construction, pre-braided monoidal categories and locally homogeneous categories for the convenience of the reader. It takes up the framework of
, Quillen's bracket construction We fix a strict monoidal groupoid (G, 0)
,
, A morphism from A to B in the category UG is an equivalence class of pairs (X, f ), where X is an object of G and f : XA ? B is a morphism of G
, ? For all objects X of UG, the identity morphism in the category UG is given by
,
, The strict monoidal category (G, 0) is said to have no zero divisors if for all objects A and B of G, AB ? = 0 if and only if A ? = B ? = 0
, the boundary connected sum along marked half-discs defines a monoidal product on SA, and the 3-disc D 3 is the unit. The braiding of the monoidal structure is given by doing half a Dehn twist in a neighbourhood of the marked half-disc and it is a symmetry
, As for the groupoid ?, the disjoint union of finite sets induces a symmetric monoidal structure (?, 0), the unit 0 being the empty set. We denote by S ? : (N, ?) ? Gr the family of groups
, surjections {ps n } n?N define a strict monoidal functor PS : SA ? W?. Let PS ?
,
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