单圈图最小特征值的Sharp下界

设G是一个具有n个顶点的简单图，λn(G)为图G的最小特征值，而单圈图就是其边数等于点数的连通图，本文给出了单圈图最小特征值的一个Sharp下界，并同时给出达到这个下界的极图。     

关于利润理论的讨论

本文对传统的利润理论中的投资概念与凯恩斯主义简单收入模型中的投资概念进行了比较和讨论，从而为这两种理论的协调提出了一种新的看法。     

The combinatorial construction for a class of optimal optical orthogonal codes

Optical orthogonal code (OOC) has good correlation properties. It has many important applications in a fiber-optic code-division multiple access channel. In this paper, a combinatorial construction for optimal(15p, 5,1) optical orthogonal codes withp congruent to 1 modulo 4 and greater than 5 is given by applying Weil's Theorem. From this, whenv is a product of primes congruent to 1 modulo 4 and greater than 5, an optimal (15v, 5, 1)-OOC can be obtained by applying a known recursive construction.     

Lattice tensor products. II

G. Grätzer and F. Wehrung has recently introduced the lattice tensor product, A?B, of the lattices A and B. In this note, for a finite lattice A and an arbitrary lattice B, we compute the ideal lattice of A?B, obtaining the isomorphism Id(A?B)≌A?Id B. This generalizes an earlier result of G. Grätzer and F. Wehrung proving this isomorphism for A = M_3 and B n-modular. We prove this isomorphism by utilizing the coordinatization of A?B introduced in Part I of this paper.     

多变量FUZZY关系方程组解的进一步研究

本文给出一个把多变量ＦＵＺＺＹ关系方程组的求解问题转化为单变量ＦＵＺＺＹ关系方程组来加以解决的方法，这一方法被应用到关于解集结构的研究上，获得了良好的结果。     

一类数字映射的全局结构

本文讨论映射T_n:x→[x~2]_n的全局结构.T_2具有对称的不连通子结构的性质和[1]用计算机得到的结果一致.但当n=3时,这些子结构不再具有对称性了.本文得到随n增大时T_n的全局分叉结构,并得到了映射T_n,μ:x→[μx~2]_n的类似结果.     

On constructing games with a convex set of equilibrium strategies

Necessary and sufficient conditions on a convex setC (of strategy pairs) are given for the existence of a 2×n bimatrix game with equilibrium setC. This is done with the use of a geometric-combinatorial solution method for 2×n bimatrix games.

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Zusammenfassung Es werden notwendige und hinreichende Bedingungen an die konvexe MengeC der Strategiepaare für die Existenz eines 2×n Bimatrix Spieles mit GleichgewichtsmengeC aufgegeben. Dies wird durch eine geometrisch-kombinatorische Lösungsmethode für 2×n Bimatrix Spiele erreicht.

     

土石坝分层填筑位移场修正的一种新方法

在进行土石坝分层填筑情况下的应力变形有限元计算时, 需要对新填土层做位移修正. 考虑 牵连位移和相对位移两个方面对新填土层中质点位移的影响, 推导了一维情况下线弹性材料 一次加荷与多级加荷时沉降的理论解, 建立了针对新填土层的一种新的位移修正方法, 应用 该方法修正分层填筑位移场可以消除位移等值线不合理的锯齿状特征, 并结合典型算例与已 有方法进行了对比分析. 结果表明, 新的位移修正方法具有较好的修正效果.     

A note on the modified simple equation method applied to Sharma-Tasso-Olver equation

Jawad et al. have applied the modified simple equation method to find the exact solutions of the nonlinear Fitzhugh-Naguma equation and the nonlinear Sharma-Tasso-Olver equation. The analysis of the Sharma-Tasso-Olver equation obtained by Jawad et al. is based on variant of the modified simple equation method. In this paper, we provide its direct application and obtain new 1- soliton solutions.     

Spectral sequences in combinatorial geometry: Cheeses, inscribed sets, and Borsuk-Ulam type theorems

Algebraic topological methods are especially well suited for determining the non-existence of continuous mappings satisfying certain properties. In combinatorial problems it is sometimes possible to define a mapping from a space X of configurations to a Euclidean space Rm in which a subspace, a discriminant, often an arrangement of linear subspaces A, expresses a target condition on the configurations. Add symmetries of all these data under a group G for which the mapping is equivariant. If we remove the discriminant from Rm, we can pose the problem of the existence of an equivariant mapping from X to the complement of the discriminant in Rm. Algebraic topology may sometimes be applied to show that no such mapping exists, and hence the image of the original equivariant mapping must meet the discriminant.We introduce a general framework, based on a comparison of Leray-Serre spectral sequences. This comparison can be related to the theory of the Fadell-Husseini index. We apply the framework to:

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solve a mass partition problem (antipodal cheeses) in Rd,

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determine the existence of a class of inscribed 5-element sets on a deformed 2-sphere,

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obtain two different generalizations of the theorem of Dold for the non-existence of equivariant maps which generalizes the Borsuk-Ulam theorem.