从本文的题目就可以知道,本文的主要研究内容有两大方面:低阶对称群的子群和低阶对称群的不变子群..在研究低阶对称群的子群的问题时,主要研究了 的子群的个数,以及子群构造问题,和 的子群个数以及构造,本文仅使用了有限群的lagrange定理以及 次对称群的一些基本结果证明了4次对称群 存在而且仅存在30个子群,并且按照子群的阶数的秩序全部给出了这些子群,其结构也是十分清楚的,而且使用lagrange定理及 次对称群的结果,构造性地给出了 的一些子群. 不变子群主要是研究了 的单性的证明和换位子群, .在一个群中,两个换位子的乘积不一定是换位子,但是在 次对称群中,它的换位子群的元素都是换位子,即在 次对称群中两个换位子的乘积仍然是一个换位子,关于这一结论,给出了一种理论证明,在此基础上,具体给出了一种将 次对称群中的元素表示成换位子的方法,并利用反例,提出存在这样的群 ,它的换位子群中存在这样的元素,它不能表示成 中任何两个元素的换位子.在给出 的单性的证明时,主要参考历史上的经典证明方法和利用换位子的证明方法,这样对 的研究更深一步.
From the title of this article can be aware that the main contents of this article has two main aspects: low-symmetry group and the subgroup of low-symmetry group of the same subgroup in the study .. group of low-symmetry subgroup of the question, The main study of the number of subgroups, as well as the issue of subgroup structure and the number of sub-groups as well as the structure, this article uses only a limited group of lagrange Theorem, as well as meeting some of the basic symmetry group results prove the existence of symmetry groups 4 and only 30 sub-groups exist, and in accordance with the order of subgroups of the order is given all these sub-groups, its structure is very clear, and the use of lagrange Theorem and the results of sub-symmetry group, given the structure of some sub - group. the same subgroup is to study the evidence of single-sex and commutator group. in a group, the two-for-position for the product is not necessarily the position, but in the sub-symmetry group, its commutator group commutator of the elements, that is, in the sub-symmetry group of two-for-seat-for-product is still a seat on the conclusions of this paper, a theory to prove, on this basis, the specific will be given a time symmetry group of elements that change position as the methods and the use of counter-examples, the existence of such a group, its commutator group of the existence of such elements, it does not mean that any two elements into the commutator. in the given proof of single-sex, the main reference in the history of the classical proof methods and the use of proven methods for the seat, so that a deeper study of the step.顺便说一句 这种翻译google上面就有 免费 呵呵
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