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Range-Kernel orthogonality and elementary operators on certain Banach spaces

Bachir Ahmed, Segres Abdelkader, Sayyaf Nawal Ali, Ouarghi Khalid

Demonstratio Mathematica

2021

Vol. 54, nr 1

272--279

The characterization of the points in Cp:1≤p<∞(H) , the Von Neuman-Schatten p-classes, that are orthogonal to the range of elementary operators has been done for certain kinds of elementary operators. In this paper, we shall study this problem of characterization on an abstract reflexive, smooth and strictly convex Banach space for arbitrary operator. As an application, we consider other kinds of elementary operators defined on the spaces Cp:1≤p<∞(H), and finally, we give a counterexample to Mecheri’s result given in this context.

On residualities in the set of Markov continuous semigroups on C1

Kuna B.

Demonstratio Mathematica

2006

Vol. 39, nr 2

439-453

We show that the set of all stochastic strongly continuous semigroups on C1 such that limt-oo |||T(t) - Qx*||| = 0, where Qx* is one-dimensional projection for some state X*, is norm open and dense. Moreover this set forms a norm dense Gb if a state X* is strictly positive.