状态集 （State Sets）的布尔（Boolean）运算（例如合集、交集和 差集）和可达集（Reachable Set）运算（例如后继（Successor） 和前驱（Predecessor）运算）都被用于符号化方法。
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local reachable set 局部可达集
Output reachable set 输出可达集
perturbed reachable set 摄动可达集
stochastic reachable set 随机可达集
reachable set of singular system 广义系统的可达集
In detail, the major contributions of this dissertation are as follows:1. Considering linear systems with time-varying but norm-boundeduncertainties, the Z,, index (peak-to-peak gain) robust controller is proposed by bounding the reachable set with inescapable ellipsoids.2.
具体地，本文的贡献主要在以下几个方面： 1．对一类线性连续系统，考虑范数有界不确定性，以状态非逃逸集逼近系统可达集，提出了一种L1指标下（峰峰增益）鲁棒控制器综合方法。
参考来源 - 不确定系统鲁棒性能分析与综合研究·2,447,543篇论文数据，部分数据来源于NoteExpress
We present a quick method to mine the frequent path and the reachable set and probability of web pages browsed by users based on the suffix tree;
给出了基于后缀树用户浏览频繁路径、页面可达集和可达概率的快速计算方法；
It then traverses the chain of references until all (directly or indirectly) reachable objects from the root set are marked.
跟踪然后遍历引用链直至标记完根集中所有(直接或间接)可获得的对象。
After processing the soft references, the set of weakly reachable objects is identified — objects for which no strong or soft references exist.
处理软引用之后，弱可及对象的集合被识别——这样的对象上不存在强引用或软引用。
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