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  • 标题:M -quasi-hyponormal composition operators
  • 本地全文:下载
  • 作者:Pushpa R. Suri ; N. Singh
  • 期刊名称:International Journal of Mathematics and Mathematical Sciences
  • 印刷版ISSN:0161-1712
  • 电子版ISSN:1687-0425
  • 出版年度:1987
  • 卷号:10
  • 期号:3
  • 页码:621-623
  • DOI:10.1155/S0161171287000760
  • 出版社:Hindawi Publishing Corporation
  • 摘要:

    A necessary and sufficient condition is obtained for M -quasi-hyponormal composition operators. It has also been proved that the class of M -quasi-hyponormal composition operators coincides with the class of M -paranormal composition operators. Existence of M -hyponormal composition operators which are not hyponormal; and M -quasihyponormal composition operators which are not M -hyponormal and quasi-hyponormal are also shown.

  • 关键词:M-hyponormal; M-quasi-hyponormal; M-paranormal; normal; composition operators.
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