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151.
The D-η-proper prequasi-invexity of vector-valued functions is characterized by means of (weak) nearly convexity and density of sets.Under weaker assumptions,some equivalent conditions for D-η-proper prequasi-invexity are derived. 相似文献
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156.
In terms of the almost complex affine connection and moving unitary frames,all totally rael minimal immersions from R^2 into the nearly Kahler S^6 are determine explicitly. Moreover, the complete flat almost complex curves in the nearly Kahler S^6 aredetermined completely. 相似文献
157.
A topological space (X, π) is said to be nearly Lindelöf if every regularly open cover of (X, π) has a countable subcover. In this paper we study the effect of mappings and some decompositions of continuity on nearly Lindelöf spaces. The main result is that a δ-continuous image of a nearly Lindelöf space is nearly Lindelöf. 相似文献
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I.M. Hanafy 《Fuzzy Sets and Systems》1997,90(3):365-353
The aim of this paper is devoted to make use of operations on IX of a fuzzy topological space X to unify and generalize classes of strong forms of fuzzy complete continuity. Furthermore, we add more types of strong forms of fuzzy completely continuous functions by choosing special operations. A comparison between these types of functions is of interest. Preservations of some fuzzy aspects under these functions are studied. 相似文献
160.
A new class of models, which combines closed queueing networks with branching processes, is introduced. The motivation comes
from MIMD computers and other service systems in which the arrival of new work is always triggered by the completion of former
work, and the amount of arriving work is variable. In the variant of branching/queueing networks studied here, a customer
branches into a random and state-independent number of offspring upon completing its service. The process regenerates whenever
the population becomes extinct. Implications for less rudimentary variants are discussed. The ergodicity of the network and
several other aspects are related to the expected total number of progeny of an associated multitype Galton-Watson process.
We give a formula for that expected number of progeny. The objects of main interest are the stationary state distribution
and the throughputs. Closed-form solutions are available for the multi-server single-node model, and for homogeneous networks
of infinite-servers. Generally, branching/queueing networks do not seem to have a product-form state distribution. We propose
a conditional product-form approximation, and show that it is approached as a limit by branching/queueing networks with a
slowly varying population size. The proof demonstrates an application of the nearly complete decomposability paradigm to an
infinite state space.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献