第二章，主要研究有限反射群的最长元以及和最长元相对应的有限反射群的自同构。
In Chapter 2, we investigate the longest elements and the corresponding special automorphism of finite reflection groups.
确定一个群的自同构群和内自同构群的结构往往十分困难，还没有一般性的理论及方法。
It is often very difficult to identify the structure of the automorphism group and the inner automorphism group of a group, and there is no general theory and method.
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