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S. S. Dragomir

Publications and source records attributed to S. S. Dragomir.

11 recordsLinked to original sources

Hermite-Hadamard type inequality for operator preinvex functions

In this paper we establish a Hermite- Hadamard type inequality for operator preinvex functions and an estimate of the right hand side of a Hermite- Hadamard type inequality in which some operator preinvex functions of selfadjoint operators in Hilbert spaces are involved.

math.FA

Spectral Radius Inequalities for Functions of Operators Defined by Power Series

By the help of power series f we can naturally construct another power series that has as coefficients the absolute values of the coefficients of f. Utilising these functions we prove some inequalities for the spectral radius of the bounded linear operator f(T) on a complex Hilbert space and some functions of its norm. The case of two commuting operators is also investigated.

math.FA

Bessel type inequalities in Hilbert C*-modules

Regarding the generalizations of the Bessel inequality in Hilbert spaces which are due to Bombiari and Boas--Bellman, we obtain a version of the Bessel inequality and some generalizations of this inequality in the framework of Hilbert $C^*$-modules.

math.FA