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111.
《Discrete Mathematics》2018,341(10):2708-2719
112.
We prove a common fixed point theorem for discontinuous,noncompatible mappings on noncomplete intuitionistic fuzzy metric spaces by using a new commutativity condition.We validate our main result by an example. 相似文献
113.
利用完备分配格L上的s-模定义格L上的矩阵运算,给出这些运算的一些基本性质,并且定义格L上的s-幂零矩阵,给出一些全新的结果. 相似文献
114.
Iiro Honkala 《Discrete Mathematics》2006,306(21):2670-2681
Assume that G=(V,E) is an undirected graph, and C⊆V. For every v∈V, we denote by I(v) the set of all elements of C that are within distance one from v. If all the sets I(v) for v∈V?C are non-empty, and pairwise different, then C is called a locating-dominating set. The smallest possible density of a locating-dominating set in the infinite triangular grid is shown to be . 相似文献
115.
Arthur S. Finbow 《Discrete Applied Mathematics》2010,158(12):1224-368
For a positive integer k, a k-packing in a graph G is a subset A of vertices such that the distance between any two distinct vertices from A is more than k. The packing chromatic number of G is the smallest integer m such that the vertex set of G can be partitioned as V1,V2,…,Vm where Vi is an i-packing for each i. It is proved that the planar triangular lattice T and the three-dimensional integer lattice Z3 do not have finite packing chromatic numbers. 相似文献
116.
This note shows that solving fully fuzzy linear programming (FFLP) model presented by Kumar et al. [A. Kumar, J. Kaur, P. Singh, A new method for solving fully fuzzy linear programming problems, Appl. Math. Model. 35 (2011) 817–823] needs some corrections to make the model well in general. A new version is provided in this note. A simple example is also presented to demonstrate the new form. 相似文献
117.
Let Tn (F) be the algebra of all n×n upper triangular matrices over an arbitrary field F. We first characterize those rank-one nonincreasing mappings ψ: Tn (F)→Tm (F)n?m such that ψ(In ) is of rank n. We next deduce from this result certain types of singular rank-one r-potent preservers and nonzero r-potent preservers on Tn (F). Characterizations of certain classes of homomorphisms and semi-homomorphisms on Tn (F) are also given. 相似文献
118.
120.
Yannis Kallinderis Eleni M. Lymperopoulou Georgios Spyridonos Panagiotis Antonellis 《国际流体数值方法杂志》2019,91(2):63-96
Curved geometries and the corresponding near-surface fields typically require a large number of linear computational elements. High-order numerical solvers have been primarily used with low-order meshes. There is a need for curved, high-order computational elements. Typical near-surface meshes consist of hexahedral and/or prismatic elements. The present work studies the employment of quadratic meshes that are relatively coarse for field simulations. Directionally quadratic high-order elements are proposed for the near-surface field regions. The quadratic meshes are compared with the conventional low-order ones in terms of accuracy and efficiency. The cases considered include closed surface volume calculations, as well as computation of gradients of several analytic fields. A special method of adaptive local quadratic meshes is proposed and evaluated. Truncation error analysis for quadratic grids yields comparison with the conventional linear hexahedral/prismatic meshes, which are subject to typical distortions such as stretching, skewness, and torsion. 相似文献