... open mapping theorem 开映射定理 open neighborhood 开邻域 open ordered set 开有序集 ...
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开邻域基 open neighbourhood base
邻域开发 Neighborhood Development
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文中证明了如果广义对称系统在一点的邻域可控，那么系统在包含该点群作用轨道的一个开集上是可控的。
It is shown that if a generalized symmetric system is controllable on a neighborhood of a point, then the system is controllable on some open set which includes the group action-orbit at the point.
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