defining operator

• 定义算子

defining operator的用法和样例：

例句

1. Every normal operator is trivially subnormal.
   每一个正规算子显而易见地是次正规的。
2. In this paper, an isolated point operator was used to define a topology on an abstract set.
   摘要在本文中，笔者使用了孤立算子定义拓扑。