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.
Comment: 9 pages. arXiv admin note: text overlap with arXiv:1207.0928