按作者与版本查阅
以下按已登记位置排列。出现顺序、原文引用与已登记依赖分别展示;最早位置不代表全书首次定义。
Szekeres · source-snapshot-bc3404156f6e
已登记出处中的最早位置:§19.3 · en。
来源短摘录与定位
§19.3 · en · original_transcription · unreviewed
A Lie subgroup of a Lie group is a subgroup that is a Lie group, and such that the natural injection map defined by makes it into an embedded submanifold of . It is called a closed subgroup if in addition is a closed subset of . In this case the embedding is regular and its topology is that induced by the topology of (see Example 15.12). The injection induces a Lie algebra homomorphism , which is clearly an isomorphism of with a Lie subalgebra of . We may therefore regard the Lie algebra of the Lie subgroup as being a Lie subalgebra of .
§19.3 · zh-CN · translation · unreviewed
李群 的 李子群(Lie subgroup) 是一个子群,它本身是李群,并且使得由 定义的自然单射 将其变为 的嵌入子流形。如果此外 是 的闭子集,则称其为 闭子群(closed subgroup)。在这种情况下,嵌入是正则的,其拓扑是由 的拓扑诱导的拓扑(见例 15.12)。单射 诱导出李代数同态 ,它显然是 与 的一个李子代数的同构。因此,我们可以把该李子群的李代数视为 的一个李子代数。