On the paper: Numerical radius preserving linear maps on Banach algebras

Mohammed El Azhari (1)

1 UM5 - Université Mohammed V de Rabat [Agdal]

In this note, we give a counterexample disproving two results in the above paper.

Mots clés: Banach algebra; regular norm; normalized state

Domaines: Analyse fonctionnelle [math.FA]

Mohammed El Azhari. On the paper: Numerical radius preserving linear maps on Banach algebras. 2015. ⟨hal-01292407v1⟩