January 1, 2003Open Access

A numerical radius inequality and an estimate for the numerical radius of the Frobenius companion matrix

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Abstract

It is shown that if A is a bounded linear operator on a complex Hilbert space, then w (A) 12 (\| A \| + \| A² \|^1/2), where w (A) and \|A\| are the numerical radius and the usual operator norm of A, respectively. An applicati

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Fuad Kıttaneh (Wed,) studied this question.

synapsesocial.com/papers/69d73b70ef4aa71f97f30918 https://doi.org/https://doi.org/10.4064/sm158-1-2

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