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On Limit Sets and Discreteness Criteria for Nonelementary Subgroups of M(~n)
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作者 Bin Lin DAI Ai Nong FANG 《Acta Mathematica Sinica,English Series》 SCIE CSCD 2005年第3期465-472,共8页
In this paper, we will study the nonelementary groups of MSbius transformations in R^n and some properties are obtained. Also in this paper we will prove several theorems about discreteness criteria and group converge... In this paper, we will study the nonelementary groups of MSbius transformations in R^n and some properties are obtained. Also in this paper we will prove several theorems about discreteness criteria and group convergence of nonelementary groups of M(R^n). 展开更多
关键词 Limit set nonelementary group Discrete group Isometry group
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The Existence and Application of Strongly Idempotent Self-orthogonal Row Latin Magic Arrays
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作者 Yu-fang ZHANG Jing-yuan CHEN +1 位作者 Dian-hua WU Han-tao ZHANG 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2018年第4期693-702,共10页
Let N = {0, 1, ···, n-1}. A strongly idempotent self-orthogonal row Latin magic array of order n(SISORLMA(n) for short) based on N is an n × n array M satisfying the following properties:(1)... Let N = {0, 1, ···, n-1}. A strongly idempotent self-orthogonal row Latin magic array of order n(SISORLMA(n) for short) based on N is an n × n array M satisfying the following properties:(1) each row of M is a permutation of N, and at least one column is not a permutation of N;(2) the sums of the n numbers in every row and every column are the same;(3) M is orthogonal to its transpose;(4) the main diagonal and the back diagonal of M are 0, 1, ···, n-1 from left to right. In this paper, it is proved that an SISORLMA(n)exists if and only if n ? {2, 3}. As an application, it is proved that a nonelementary rational diagonally ordered magic square exists if and only if n ? {2, 3}, and a rational diagonally ordered magic square exists if and only if n ≠2. 展开更多
关键词 Diagonally ordered magic square IDEMPOTENT nonelementary rational self-orthogonal row Latinmagic array self-orthogonal Latin squares with holes
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