Abstract
Gau, Wang and Wu in their LAMA'2016 paper conjectured (and proved for n < 4) that an n-by-n partial isometry cannot have a circular numerical range with a non-zero center. We prove that this statement holds for n = 5.
Original language | English (US) |
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Pages (from-to) | 107-113 |
Number of pages | 7 |
Journal | Electronic Journal of Linear Algebra |
Volume | 38 |
DOIs | |
State | Published - 2022 |
Keywords
- Kippenhahn curve
- Kippenhahn polynomial
- Numerical range
- Partial isometry
ASJC Scopus subject areas
- Algebra and Number Theory