Crouzeix's conjecture for scaled q-numerical ranges
Crouzeix's conjecture for scaled q-numerical ranges
Let be an matrix, let , and let denote the scaled -numerical range introduced in the source. For a polynomial with complex coefficients, the scaled -numerical-range conjecture.
This conjecture generalises Crouzeix's conjecture from the classical numerical range to scaled -numerical ranges. When , the set reduces to the numerical range , recovering the known spectral-constant bound; the proposed inequality is presented without a resolution in the source.
Sources & referencesView supporting material
Primary source
Ryan O'Loughlin and Jyoti Rani, “q-Numerical Ranges and Spectral Sets”, arXiv:2603.15536 (2026).
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