Weak Hopf algebras and singular solutions of Quantum Yang-Baxter equation

Details Weak Hopf algebras and singular solutions of Quantum Yang-Baxter equation Weak Hopf algebras and singular solutions of Quantum Yang-Baxter equation

2001-05-09

arxiv.org/abs/math/0105064v1

Commun. Math. Phys. 225 2002 191

Mathematics

Quantum Algebra

AMSLaTeX2e (amsart,amsmath,amsfonts,amssymb), 24 p. For other formats see http://gluon.physik.uni-kl.de/~duplij

Scientific paper

10.1007/s002201000576

We investigate a generalization of Hopf algebra $\mathfrak{sl}_{q}(2)$ by weakening the invertibility of the generator $K$, i.e. exchanging its invertibility $KK^{-1}=1$ to the regularity $K\overline{K}K=K$. This leads to a weak Hopf algebra $w\mathfrak{sl}_{q}(2)$ and a $J$-weak Hopf algebra $v\mathfrak{sl}_{q}(2)$ which are studied in detail. It is shown that the monoids of group-like elements of $w\mathfrak{sl}_{q}(2)$ and $v\mathfrak{sl}_{q}(2)$ are regular monoids, which supports the general conjucture on the connection betweek weak Hopf algebras and regular monoids. Moreover, from $w\mathfrak{sl}_{q}(2)$ a quasi-braided weak Hopf algebra $\overline{U}_{q}^{w}$ is constructed and it is shown that the corresponding quasi-$R$-matrix is regular $R^{w}\hat{R}^{w}R^{w}=R^{w}$.

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