In section 1.1. we define the mapping a on circle in double quiver Q of a quiver Q, and give a strict defition of bracket operation in Lie algebra,then prove it is a Lie bracket.
在1．1节中，我们定义了箭图Q的重箭图（?） 循环上的映射σ，用它给出了项链李代数括号运算的一个严格定义，并用此定义证明了这是一个李运算。
参考来源 - 项链李代数的结构与性质·2,447,543篇论文数据，部分数据来源于NoteExpress
Objective: To explore the application and selection of bracket in upper ureter operation.
目的：探讨上尿路手术中支架管的选择及其应用。
A gang-board is arranged on the operation platform bracket.
操作台支架上设有梯板。
The tool bracket has simple operation, convenient height adjustment, free movement, safe and reliable performance and meanwhile more symmetrical and reasonable appearance.
本实用新型操作简单、高度调节方便、移动自如、安全可靠，同时，外形更加匀称、合理。
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