共查询到19条相似文献,搜索用时 78 毫秒
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本文首先指出了文献[1]所给出的关于环网G(N;s1,s2)的直径的计算公式是错误的;然后给出了计算G(N;s1,s2)的直径的正确方法 相似文献
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关于环网G(N;S1,S2)的直径 总被引:6,自引:0,他引:6
本文首先给出了环网G(N;s_1,s_2)存在有限直径的充要条件;用初等数论方法给出了其直径的简明计算公式;最后讨论了类似文献[3]的环网直径的对偶性问题. 相似文献
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设G为2~3·3~3阶(即216阶)群,本文研究G的同构分类.利用有限群的局部分析法,证明G共有177种互不同构的类型,并获得了G的全部构造. 相似文献
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古志鸣 《数学年刊A辑(中文版)》1995,(1)
设M,N是两个单连通的闭流形,f:M→N是同伦等价.本文利用过去的一个结论,定义了一个上同调系同构H*(N*;G)→(M*;G),其中M*,N*分别是血与N的去核乘积.然后,运用周学光引入的特征上同调运算于,证明了在某些情形下,有几何实现,从而M*与N*同伦等价. 相似文献
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四角系统是一个二部图,二部图有完美匹配的一个必要条件是对其顶点进行正常着色后,两个色类所含的顶点数相等,然而这一条件并不充分,本文利用构造法证明了两个色类所含顶点数相等却无完美匹配的四角系统的最小阶数是14,并且只有3种非同构的形状,由本文的方法还可以进一步构造出15阶和16阶无完美匹配四角系统的所有非同构形状,它们的数目分别是22与155。 相似文献
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本文证明了若余代数C和D是Morita Takeuchi等价的,则C的子余代数格和D的子余代数格同构.设MΓ,NΓ是拟有限右Γ 余模,则(h-Γ(M,M),h-Γ(N,N);h-Γ(N,M),h-Γ(M,N);f,g)有Morita Takeuchi关系.并给出了此M T关系是M T等价条件的及由已知的M T关系构造新的M T关系的方法. 相似文献
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双环网是计算机互连网络和通讯系统的一类重要拓扑结构,已广泛应用于计算机互连网络拓扑结构的设计中.利用L形瓦理论,结合中国剩余定理和二次同余方程的性质,给出了不同于参考文献中的任意k紧优双环网的无限族的构造方法,证明了对任意正整数k,若n(t)=3t2 At B,A=1,3,5,对于一定的B>(k 1)2,均存在正整数t,使得{G(n(t);s(t))}是k紧优双环网的无限族,而且这样的无限族有无穷多类.作为定理的应用,给出了多类新的k紧优双环网的无限族. 相似文献
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该文给出一种寻找k -紧优的双环网络无限族(k>=0)的方法, 利用此方法得到了2族3 -紧优的有向双环网络无限族 相似文献
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We prove the isomorphism problem for integral loop rings of finitely generated RA loops using a decomposition of the loop of units. Also we describe the finitely generated RA loops whose loops of units satisfy a certain property. 相似文献
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Petteri Kaski Patric R.J. Östergård Olli Pottonen 《Journal of Combinatorial Theory, Series A》2006,113(8):1764-1770
The Steiner quadruple systems of order 16 are classified up to isomorphism by means of an exhaustive computer search. The number of isomorphism classes of such designs is 1,054,163. Properties of the designs—including the orders of the automorphism groups and the structures of the derived Steiner triple systems of order 15—are tabulated. A consistency check based on double counting is carried out to gain confidence in the correctness of the classification. 相似文献
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We fix an orientation issue that appears in our previous paper about the isomorphism between Floer homology of cotangent bundles and loop space homology. When the second Stiefel‐Whitney class of the underlying manifold does not vanish on 2‐tori, this isomorphism requires the use of a twisted version of the Floer complex. © 2014 Wiley Periodicals, Inc. 相似文献
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Edgar G. Goodaire Cesar Polcino Milies 《Rendiconti del Circolo Matematico di Palermo》1988,37(1):126-135
This paper first settles the “isomorphism problem” for alternative loop rings; namely, it is shown that a Moufang loop whose integral loop ring is alternative is determined up to isomorphism by that loop ring. Secondly, it is shown that every normalized automorphism of an alternative loop ringZ L is the product of an inner automorphism ofQ L and an authomorphism ofL. 相似文献
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A loop whose inner mappings are automorphisms is an automorphic loop (or A-loop). We characterize commutative (A-)loops with middle nucleus of index 2 and solve the isomorphism problem. Using this characterization and certain central extensions based on trilinear forms, we construct several classes of commutative A-loops of order a power of 2. We initiate the classification of commutative A-loops of small orders and also of order p 3, where p is a prime. 相似文献