Woit · §5.2 Lie algebras of the orthogonal and unitary groups
英文原文
The section discusses exponential surjectivity for SL(n,R) and SL(n,C) before the explicit summary definition.
原文相关讨论摘录
One can show that and matrices can be diagonalized by conjugation by a unitary matrix and thus show that any matrix can be written as an exponential of something in the Lie algebra. The corresponding theorem is also true for but requires looking at diagonalization into 2 by 2 blocks. It is not true for (you can’t reach the disconnected component of the identity by exponentiation). It also turns out to not be true for the groups and for (while the groups are connected, they have elements that are not exponentials of any matrix in or respectively).
来源与版本
正文:英文原文
来源版本:2025-10-20
原文位置:§5.2;PDF 页 68、69、70;印刷页 51、52、53
处理记录:PDF 文字层提取;MinerU OCR;AI 辅助转录对照
核对状态:AI 辅助转录核对,未作人工审阅或数学审稿
来源 PDF SHA-256:5a1941b2443b54d5db3d055f1e5ba390429b7a728475258017aaac87ee85a837
中文译文
The section discusses exponential surjectivity for SL(n,R) and SL(n,C) before the explicit summary definition.
译文摘录
可以证明, 和 矩阵可以通过酉矩阵共轭对角化,从而证明任何 矩阵都可以写成李代数中某个元素的指数。 相应的定理对 也成立,但需要考察对角化为 2 乘 2 块的情形。 对 而言这并不成立(你无法通过指数映射到达单位元的非连通分支)。 对于群 和 ,当 时,该结论也被证明不成立(尽管这些群是连通的, 它们含有分别不是 或 中任何矩阵的指数元的元素)。
来源与版本
正文:中文译文
来源版本:2025-10-20
原文位置:§5.2;PDF 页 68、69、70;印刷页 51、52、53
处理记录:machine-translation/deepseek-v4.1-flash
核对状态:译文尚未审核
Woit · §5.3 A summary
英文原文
The author defines SL(n,R) and SL(n,C) as invertible matrices with determinant one.
原文定义摘录
- The special linear groups and are the groups of invertible matrices with determinant one. Their Lie algebras and are the Lie algebras of all by matrices with zero trace.
来源与版本
正文:英文原文
来源版本:2025-10-20
原文位置:§5.3;PDF 页 71;印刷页 54
处理记录:PDF 文字层提取;MinerU OCR;AI 辅助转录对照
核对状态:AI 辅助转录核对,未作人工审阅或数学审稿
来源 PDF SHA-256:5a1941b2443b54d5db3d055f1e5ba390429b7a728475258017aaac87ee85a837