The braided monoidal structures on the category of vector spaces graded by the Klein group

Details The braided monoidal structures on the category of vector spaces graded by the Klein group The braided monoidal structures on the category of vector spaces graded by the Klein group

2009-12-03

arxiv.org/abs/0912.0679v1

Mathematics

Quantum Algebra

22 pages

Scientific paper

Let $k$ be a field, $k^*=k\setminus\{0\}$ and $C_2$ the cyclic group of order 2. In this note we compute all the braided monoidal structures on the category of $k$-vector spaces graded by the Klein group $C_2\times C_2$. Actually, for the monoidal structures we will compute the explicit form of the 3-cocycles on $C_2\times C_2$ with coefficients in $k^*$, while for the braided monoidal structures we will compute the explicit form of the abelian 3-cocycles on $C_2\times C_2$ with coefficients in $k^*$. In particular, this will allow us to produce examples of quasi-Hopf algebras and weak braided Hopf algebras, out of the vector space $k[C_2\times C_2]$.

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