1) δ-open sets
δ-开集
1.
It is that the all δ-open sets are open sets,all open sets are α-open sets,α-open sets are semi-open sets and preopen sets,semi-open sets or preopen sets are β-open sets.
在一般拓扑空间中讨论了抽象集合的概念,研究了其性质,得出如下结论,即:所有的δ-开集都是开集,所有开集又都是α-开集,α-开集是半开集且预开集,半开集或预开集是β-开集,反之则不成立。
2) δ-open(closed)sets
δ-开(闭)集
3) δ-open L-sets
δ-开L-集
1.
A notion called δ-compactness is presented in L-topological spaces by means of δ-open L-sets and their inequality, where L is a complete De Morgan algebra.
在L-拓扑空间中借助于δ-开L-集和它们的不等式给出了δ-紧性的定义,这里L是完备的De Morgan代数。
4) δ expanded form
δ展开
1.
Based on the theory, the component level circuit structures of five-valued resetting inverter and dynamic D flip-flop are deduced firstly from five-valued circuit function using δ expanded form.
在此基础上,首先用δ展开法由五值电路功能直接推出具有复位功能的五值反相器和动态D触发器的元件级结构。
5) δ phase concentration zone
δ相密集区
1.
The relationship between impact energy and the area percentage of δ phase concentration zone in microstructure of alloy GH4169 has been studied quantitatively.
对ＧＨ４１６９合金中的δ相密集区所占的面积分数与冲击功的关系进行了定量研究，并用ＳＥＭ观察了冲击断口的表面，结果表明：ＧＨ４１６９合金的冲击功随组织中δ相密集区所占的面积分数增大而减小，冲击断口为韧窝断口。
补充资料：开集
开集
open set
开集【雌..就;。了盆p‘noe姗。欲cT加]，拓扑空间中的 该空间的拓扑(见拓扑结构(拓扑)(t俄力吻灿1sto义t理re(tQI扣10gy)))的一个元素.更明确地说，设拓扑空间(X，动的拓扑;定义为集X的子集系T，使得l)X任:，必‘T;2)如果o，。:，i二l，2，则0，自0:“;;3)如果o二任T，:〔级，则U{0:::“吸}e:.于是，空间(X，:)中的开集(openset)就是拓扑:的元素，并且只是这些元素. E .A.nacb几王K.撰
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