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A Lie grading which is not a semigroup grading |
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| Authors: | Alberto Elduque |
| Institution: | Departamento de Matemáticas, Universidad de Zaragoza, 50009 Zaragoza, Spain |
| Abstract: | This note is devoted to the construction of a graded Lie algebra, whose grading is not given by a semigroup; thus providing a counterexample to an assertion by Patera and Zassenhaus. |
| Keywords: | Primary 17B70 |
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