On the paper: Numerical radius preserving linear maps on Banach algebras
classification
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statebanachnormalizedadmittingalgebraalgebrascommutativecomplex
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We give an example of a unital commutative complex Banach algebra having a normalized state which is not a spectral state and admitting an extreme normalized state which is not multiplicative. This disproves two results by Golfarshchi and Khalilzadeh.
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