THE NUMERICAL RANGE OF LINEAR OPERATORS SALAH MECHERI Abstract. In [27] J.P.Williams showed that an operator A ∈ B(H) is normaloid if and only if it is convexoid. It is known that the part if in J.P.William’s result

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• Theoretical physics
• Hyponormal operator
• Spectrum
• Paranormal operator
• Banach algebra
• C*-algebra
• Hilbert space
• Normal operator
• Contraction
• Operator theory
• Mathematical analysis
• Functional analysis