point finite cover是什么意思

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用法例句

Supposed X and Y are both topological vector spaces and X is of the second category, if0 is pointwise bounded, then must be equicontinuous.

设X,Y为拓扑向量空间,X是第二纲的,若AB0逐点有界,则A是等度连续的。

By means of the concept of inductively compact-covering and weakly compact mappings introduced, we establish the relationship between spaces with a σ-point-finite cfp-network and metric spaces.

本文研究了度量空间的象,引进诱导紧覆盖弱紧映射,建立了具有σ点有限cfp网的空间与度量空间之间的联系,将完善"映射与空间"理论。

PCG methods for solving finite element equations by nodal elements and edge elements are given respe.

针对电磁场数值分析中的大型稀疏对称线性方程组,尤其是求解棱边有限元法生成的奇异方程组,通过时谐涡流场实例计算,比较了目前文献中出现的各种预处理共轭梯度算法,提出了一种改进的预优处理的不完全乔列斯基分解共轭梯度算法,并得出了分别适用于节点有限元与棱边有限元离散方程组的最优预处理共轭梯度算法。

Lower boiling point organic acids in pharmaceutical waste water were separated by using reduced-pressure distillation.

另外通过柱层析分离高级脂肪酸,并进行衍生化处理,经GC、GC-MS检测,确定了四种高沸点有机酸的结构,含量为1。

With the development of the society and sharp increase of electricity consumption, the traditional on-load tap changers of the power transformer and the existing AC voltage regulators can not be satisfied by the requirements of power system, so a novel no-contact on-load voltage regulator topology is given in this paper.

目前正研究的无触点有载调压变压器,由于晶闸管是直接用于主电路,因此需要大量的晶闸管串并联,控制复杂,体积大,价格高,并且技术也未成熟,并没有推向市场。