From 3-algebras to $Δ$-Groups

Details From 3-algebras to $Δ$-Groups From 3-algebras to $Δ$-Groups

2006-04-13

arxiv.org/abs/math/0604304v1

Mathematics

Geometric Topology

18 pages

Scientific paper

We introduce $\Delta$-groups and show how they fit in the context of lattice
field theory. To a manifold $M$ we associate a $\Delta$-group $\Gamma(M)$. We
define the symmetric cohomology $HS^n(G,A)$ of a group $G$ with coefficients in
a $G$-module $A$. The $\Delta$-group $\Gamma(M)$ is determined by the action of
$\pi_1(M)$ on $\pi_2(M)$ and an element of $HS^3(\pi_1(M),\pi_2(M))$.

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