排序方式: 共有1条查询结果,搜索用时 0 毫秒
1
1.
John B. Conway Nathan S. Feldman 《Proceedings of the American Mathematical Society》1997,125(1):243-244
In this paper an easier proof is obtained of Alexandru Aleman's extension of an inequality of Axler and Shapiro for subnormal operators to the essential norm. The method is applied to show that a hyponormal operator whose essential spectrum has area zero must be essentially normal.
1