Grassmann geometries on compact symmetric spaces of general type
Grassmann geometries on compact symmetric spaces of general type
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一般型紧对称空间上的格拉斯曼几何
DOI:
10.2969/jmsj/05030557
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发表时间:
1998
影响因子:
0.7
通讯作者:
H. Naitoh
中科院分区:
文献类型:
--
作者:
H. Naitoh
$G^{s}(T_{p}M)$ . For an arbitrary subset $\gamma$ in $G^{s}(TM)$ an $s$-dimensional connected submanifold $S$ of $M$ is called a -submanifold if at each point $p$ of $S$ the tangent space $T_{p}S$ belongs to Yr The collection of $\gamma$-submanifolds, denoted by $\mathscr{L}(M, \gamma)$ , constitutes a -geometry. The term “Grassmann geometries” in the title is a collected name for such $\gamma$-geometries and it has been introduced in R. Harvey-H. B. Lawson [4]. We now consider the following $\gamma$-geometries. Let $G$ be the isometry group of $M$ . Then it acts transitively on $M$ and at the same time acts on $G^{s}(TM)$ via the differentials of isometries. If as a subset $\gamma$ we take a $G$-orbit on $G^{s}(TM)$ by this action, the $\parallel^{\wedge}-$ geometry gives a class of submanifolds in $M$ with congruent tangent spaces. We moreover consider $G$-orbits of the following type. An $s$-dimensional linear subspace $V$ in $T_{p}M$ is called strongly curvature-invariant if it satisfies that
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
T. Kobayashi;T. Oshima
通讯作者:
T. Oshima