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arXiv 1806.07553math.RA
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李代数与Cartan类的余伴随轨道

Coadjoint orbits of Lie algebras and Cartan class

Michel Goze, Elisabeth Remm

摘要:

研究了李代数在Cartan类上的余伴随轨道。实际上,在点$α$处的余伴轨道$\mathcal{O}(α)$的切空间对应于与左不变形式$α$相关联的特征空间,并且其维数是$α$的Cartan类的偶数部分。我们应用这句话来确定李代数,使得所有的非平凡轨道(非约化为一点)具有相同的维数,特别是当这个维数是2或4。我们还确定了维数为$2n$的李代数或具有维数为$2n$的轨道的$2n+1$.

英文摘要:

We study the coadjoint orbits of a Lie algebra in terms of Cartan class. In fact, the tangent space to a coadjoint orbit $\mathcal{O}(α)$ at the point $α$ corresponds to the characteristic space associated to the left invariant form;$α$ and its dimension is the even part of the Cartan class of $α$. We apply this remark to determine Lie algebras such that all the nontrivial orbits (nonreduced to a point) have the same dimension, in particular when this dimension is 2 or 4. We determine also the Lie algebras of dimension $2n$ or $2n+1$ having an orbit of dimension $2n$.

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