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Cite Journal: Advances in Operator Theory |  Publication Date: Apr 1, 2024 |
 Citations: 1 |  License type: CC BY 4.0 |
We provide a characterization when the quaternionic numerical range of a matrix is a closed ball with center 0. The proof makes use of Fejér–Riesz factorization of matrix-valued trigonometric polynomials within the algebra of complex matrices associated with quaternion matrices.
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