On the basis of the discussion about the extension classification, the hierarchy structure of the extension set is given.
在讨论可拓分类特点的基础上，给出了关于可拓集合的层次结构形式。
Definitions of an extension field, and a stable field of multilayer multidimensional relation element extension set are given.
给出了多层高维关系元可拓集的可拓域、稳定域的定义。
The research shows that extension set and correlation degree analysis is the utility method of network security analysis and control.
研究表明，可拓集与关联度分析是网络安全分析与控制的有效工具。
Indicates that a class can use a markup extension to provide a value, and references a handler to use for markup extension set operations.
指示类可以使用标记扩展提供值，并引用要用于标记扩展设置操作的处理程序。
Based on extension set, the concept of extension resource is proposed, the types of extension resource are discussed, the developing methods of resource are analyzed.
利用可拓集合，给出了可拓资源的形式化定义；同时分析了可拓资源的类型，研究了资源的开拓方法。
By studying the relations of the extensibility of matter-element with the extension field of a matter-element extension set, two ways to determine the extension field are obtained.
通过研究物元的可拓性与物元可拓集合的可拓域之间的关系，得到了两种确定物元可拓域的途径。
This paper introduces extension and extension decision, relations and differences among extension set, classical set and fuzzy set and study trait of extension set and applied extension decision.
讨论了可拓学与可拓决策产生的实际背景，可拓集合与经典集合、模糊集合之间的区别和联系。研究了可拓集合的特点及其可拓决策应用的前景。
This paper introduces extension and extension decision, relations and differences among extension set, classical set and fuzzy set and study trait of extension set and applied extension decision.
讨论了可拓学与可拓决策产生的实际背景，可拓集合与经典集合、模糊集合之间的区别和联系。研究了可拓集合的特点及其可拓决策应用的前景。
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