Mathematics – Quantum Algebra
Scientific paper
1997-05-27
Quantum Group Symposium at Group 21, eds. H.-D. Doebner and V. K. Dobrev (Heron Press, Sofia, 1997) 219-226
Mathematics
Quantum Algebra
9 pages, LaTeX, no figure, communication at the XXI Int. Coll. on Group Theoretical Methods in Physics, Goslar, Germany, 15-20
Scientific paper
Quite recently, a ``coloured'' extension of the Yang-Baxter equation has appeared in the literature and various solutions of it have been proposed. In the present contribution, we introduce a generalization of Hopf algebras, to be referred to as coloured Hopf algebras, wherein the comultiplication, counit, and antipode maps are labelled by some colour parameters. The latter may take values in any finite, countably infinite, or uncountably infinite set. A straightforward extension of the quasitriangularity property involves a coloured universal ${\cal R}$-matrix, satisfying the coloured Yang-Baxter equation. We show how coloured Hopf algebras can be constructed from standard ones by using an algebra isomorphism group, called colour group. Finally, we present two examples of coloured quantum universal enveloping algebras.
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