摘要
对于含有两个未知数的递归生成的加权移位算子,Jung提出了其二次亚正规和正的二次亚正规是等价的。但如果细加论证可以发现,这个假设是不正确的,对此有具体的实例可以证明。
For recursively generated weighted shift which have two unknown numbers, Jung considered that quadrati- cally hyponormal and positively quadratically hyponormal are equivalent. But the author proved that the conjecture is wrong. And last he gives an example.
出处
《廊坊师范学院学报(自然科学版)》
2013年第2期17-21,共5页
Journal of Langfang Normal University(Natural Science Edition)
关键词
算子
2-亚正规
二次亚正规
正的二次亚正规
operator
2-hyponormal
quadratically hyponormal
positively quadratically hyponormal