We show that the numerical index of an L-embedded space and that of its dual coincide. In particular, the numerical index of the predual of a real or complex von Neumann algebra or JBW*-triple ...

We prove that a finite-dimensional Banach space X has numerical index 0 if and only if it is the direct sum of a real space X0 and nonzero complex spaces X1,...,Xn in such a way that the equality $||x ...

Pollutants discharged without being properly treated, have contaminated many rivers and groundwater making them unfit for consumption. This is a major constraint for development and management of ...