پديدآورندگان :
Jowkar Nasrin n.jowkar@ymail.com Department of pure Mathematics,Faculty of Mathematical sciences, Ferdowsi University of Mashhad, Mashhad, Iran; , Niknam Asadollah dassamankin@yahoo.com Department of pure Mathematics,Faculty of Mathematical sciences, Ferdowsi University of Mashhad, Mashhad, Iran;
چكيده فارسي :
In this paper, we investigate the numerical radius inequalities. In particular under some conditions on $A$ we prove that $ 2w^{2}(A)-w(A^{2}) \leq \Vert A \Vert $ where $ A$ is a bounded linear operator on a Hilbert space $ \mathcal{H} $.
