sigma discrete family of subsets是什么意思

网络释义

用法例句

A space \%X\% is said to have the property \%(wa)\% if for every open cover \%U of \%X\% and every dense subspace \%DX\%, there exists a discrete subset \%FD\% such that \%St(F, \%U \%)=X\%, where \%St(F,T]\%U \%)={U \%U \%:UF}\%.

一个空间Ｘ被称为具有性质（ｗａ），如果对于空间Ｘ的任意覆盖Ｕ和对于Ｘ的任意稠密子空间Ｄ，在Ｄ中存在一个离散子集Ｆ，使得Ｓｔ（Ｆ，Ｕ）＝Ｘ，其中Ｓｔ（Ｆ，Ｕ）＝∪｛Ｕ∈Ｕ：Ｕ∩Ｆ≠｝。

All Quarter-stratifiable spaces have a σ-closed-discrete dense subset if this space is second category and paracompact.

对第二纲的仿紧Quarter可层化空间进行了研究,证明了这类空间含有σ闭离散的稠密子集。

Synthesis of CDAH_2 resin and its enrichment behavior for potassium ion

CDAH_2树脂的制取及其对钾离子的富集性能

Enrichment of Yunnan Bowl Tea to Ce(Ⅳ) Ion in Aqueous Solution

云南沱茶自水溶液中对铈(Ⅳ)离子的富集作用

Preparation of weakly acidic cation-exchange fibers and its adsorption of iron(Ⅲ)

弱酸性阳离子交换纤维及其对水中微量铁(Ⅲ)离子的富集

Sythesis of Novel Sorbents and Applications in Separation and Preconcentration of Trace Ions

新型吸附材料的合成及其对痕量金属离子的富集分离研究

Earthworms on the Copper Ion Concentration and Its Impact on Artificial Soil Morphology of Cu-Zn

蚯蚓对铜离子的富集及其对人工土壤铜锌形态的影响

Determination of Ru in Geological Sample by Polarography after Seperation and Preconcentration Using Ion Exchange Resin;

离子交换分离富集极谱法测定地质样品中的钌

Determination of Molybdenum in soil by Separation and Preconcentration-AAS with Rich Oxygen Flame

强碱性阴离子交换树脂分离富集土壤中的钼

Preparation of Pd(Ⅱ)-Imprinted Polymer and Study on Its Property of Separation and Enrichment of Palladium(Ⅱ)

钯(Ⅱ)离子印迹聚合物的制备及其对钯(Ⅱ)离子的分离和富集性能

Study on Analysis of Lead Iron with Preconcentration and Stripping of Electrodeposition;

电沉积富集与溶出对铅离子的分析研究

Study on the Effects of Enrichment Calcium and Iron Ions on the Mycelium Culture of Ganoderma lucidum

富集钙·铁离子对灵芝菌丝体培养的影响

Determination of Zn in Food by Nanometer TiO_2 Separation and Concentration-Atomic Absorption Spectroscopy

纳米TiO_2分离富集-原子吸收法测定食品中的锌

Enrichment,Separation and Determination of Trace Selenium in Semen Cassia in Dandong Area

丹东地区决明子中微量硒的富集分离与测定

Studies on the Enrichment and Separation Characteristics of the New Ion Exchange Fiber to the Ions of Precious Metals;

新型离子交换纤维对贵金属富集分离特性的研究

Cloud-Point Extraction and Its Application to the Separation/Preconcentration and Speciation of Metal Ions;

浊点萃取技术在金属离子分离富集及形态分析中的应用

Preparation of curcumin-silica absorbent and study on absorption behaviors for trace iron and copper in drinking water by ICP-AES determination

姜黄素-硅胶吸附剂的制备及其富集分离饮用水中痕量铁铜离子

Determination of Iridium in the Bering Sea and Arctic Ocean Seawaters by Anion Exchange Preconcentration-neutron Activation Analysis

白令海和北冰洋海水中铱的阴离子交换预富集-中子活化分析

Study on Low Molecular Weight Aqueous Two-phase System and Its Applications on Extraction and Separation of Copper

低分子双水相体系的理论研究及其在铜的分离富集中的应用

Column Separation/Preconcentration and ICP-MS for Trace Elements and Elemental Speciation Analysis;

柱分离富集/等离子体质谱痕量元素及形态分析