Then, the relationship among nodal period, fundamental interval and orbital altitude was educed by deriving the definitions of fictitious node.
通过引入假想交点的概念，推导出了交点周期、基本交点距与轨道高度的关系。
Recently, many researchers have discussed the fundamental theory of the interval-valued fuzzy sets and have obtained lots of meaningful results.
目前，国内外一些学者对区间值模糊集的基础理论作了较深入的研究，并取得了一定的研究成果。
The concept of numeric interval-set is proposed for the first time, and fundamental operations on interval-sets are defined.
针对不同的变量类型，首次提出了数值型变量的区间集表示和基本运算方法，定义了布尔型区间代数和引用型区间代数；
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