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math.FA2020
Numerical index and Daugavet property of operator ideals and tensor products
Miguel Martín, Javier Merí, Alicia Quero
We show that the numerical index of any operator ideal is less than or equal to the minimum of the numerical indices of the domain and the range. Further, we show that the numerica…
math.FA2020
On the numerical index of absolute symmetric norms on the plane
Javier Merí, Alicia Quero
We give a lower bound for the numerical index of two-dimensional real spaces with absolute and symmetric norm. This allows us to compute the numerical index of the two-dimensional…
math.FA2010
Numerical index of absolute sums of Banach spaces
Miguel Martín, Javier Merí, Mikhail Popov +1
We study the numerical index of absolute sums of Banach spaces, giving general conditions which imply that the numerical index of the sum is less or equal than the infimum of the n…