Mathematics – Rings and Algebras
Scientific paper
2003-06-02
Mathematics
Rings and Algebras
Latex, 19 pages
Scientific paper
10.1023/A:1025966331750
The aim of this paper is to avoid some difficulties, related with the Lie bracket, in the definition of vector fields in a non commutative setting, as they were defined by Woronowicz, Schmudgen--Schuler and Aschieri--Schupp. We extend the definition of vector fields to consider them as derivations of the algebra, through Cartan pairs introduced by Borowiec. Then, using translations, we introduce the invariant vector fields. Finally, the definition of Lie bracket realized by Dubois--Violette, considering elements in the center of the algebra, is also extended to these invariant vector fields.
Jara Pascual
Llena David
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