摘要
Ｔｈｅ Ｃｌｏｓｅｄ Ｇｒａｐｈ定理是泛函分析中的基本定理，在数学领域内用途比较广泛．文章研究了定理的条件中被忽视的问题并给出了相应的反例．
In this paper. a neglected problem in the condition of the Closed Graph theorem is studied. The application of this is also introduced.
关键词
闭图象
闭算子
连续算子
closed graph
closed operator
continuous operator
