| On the Joint Essential Spectrum,the Joint Essential Numerical Range and the Boundary of Joint Numerical Range |
| Received:June 22, 1988 |
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| Abstract: |
| The present note gives some results of the joint essential spectrum, the joint essential numerical range and the boundary of the joint numerical range for several commuting operators. |
| Citation: |
| DOI:10.3770/j.issn:1000-341X.1990.01.006 |
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