Joint numerical ranges of operators in semi-Hilbertian spaces - Baklouti, Hamadi; Feki, Kais; Sid Ahmed, Ould Ahmed Mahmoud (Linear algebra and its applications, 2018)
Keywords: Convexity; Hilbert space; Joint numerical range; Linear algebra; Linear operators; Maximal numerical range; Numerical analysis; Positive operator; Theorems; secondary; Joint numerical range; Convexity; primary; Positive operator; Maximal numerical range