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    A Note On The Stahl’s Theorem 

    Type: Conference Paper
    Author : حامد نجفی; Hamed Najafi
    Year: 2017
    Abstract:

    ‎Let $\\mathcal{H}$ be a Hilbert space and $\\mathbb{B}(\\mathcal{H})$ denotes the algebra of all bounded linear operators on $\\mathcal{H}$ and $A$ be a bounden operator in $\\mathcal{H}$‎. ‎Let $A,B\\in\\mathbb{B}(\\mathcal{H})$ ...

    Some results on Kwong functions and related inequalities 

    Type: Journal Paper
    Author : حامد نجفی; Hamed Najafi
    Year: 2013
    Abstract:

    We investigate some relations between Kwong functions and operator monotone functions. As an application, we present an arithmetic–geometric mean type inequality by showing that for two continuous functions f, g on (0,∞)(0,∞) such that View...

    Estimates of operator convex and operator monotone functions on bounded intervals 

    Type: Journal Paper
    Author : حامد نجفی; محمد صال مصلحیان; M. Fujii; Ritsuo Nakamoto; Hamed Najafi; Mohammad Sal Moslehian
    Year: 2016
    Abstract:

    Recently the behavior of operator monotone functions on unbounded intervals with respect to the relation of strictly positivity has been investigated. In this paper we deeply study such behavior not only for operator monotone functions but also...

    More on operator monotone and operator convex functions of several variables 

    Type: Journal Paper
    Author : حامد نجفی; Hamed Najafi
    Year: 2017
    Abstract:

    $ is a $k$ variables operator convex function of order $(n_1,\\ldots,n_k)$ such that $m=n_1 n_2\\ldots n_k$‎. ‎Also‎, ‎if $f$ is an operator monotone function of order $n^{k+1}$‎, ‎then $\\phi$ is a $k$ variables operator monotone function of order $n...

    A note on some preservation results on the Laplace transform ordering of residual lives 

    Type: Journal Paper
    Author : زهره زمانی; غلامرضا محتشمی برزادران; محمد امینی; zohreh zamani; Gholam Reza Mohtashami Borzadaran; Mohammad Amini
    Year: 2017
    Abstract:

    In this paper, we provide several preservation results for Laplace transform ordering of residual lives (Lt-rl) under

    the reliability operations convolutions, mixtures and series systems. We also show that this order ...

    Operator means and positivity of block operators 

    Type: Journal Paper
    Author : حامد نجفی; Hamed Najafi
    Year: 2017
    Abstract:

    ‎The aim of this paper is to find some sufficient conditions for positivity of block matrices of positive operators‎.

    ‎It is shown that for positive operators $A,B,C$ and for every non-negative operator monotone function $f$ on $‎

    ‎(0...

    More on operator monotone functions 

    Type: Conference Paper
    Author : حامد نجفی; محمد صال مصلحیان; Hamed Najafi; Mohammad Sal Moslehian
    Year: 2012
    Abstract:

    We investigate some properties of operator monotone functions. In particular,

    we show that if f is a non-constant operator monotone function on an interval

    J and A;B are self-adjoint operators with spectra in J such that A > B, then...

    Estimation of operator monotone functions 

    Type: Conference Paper
    Author : محمد صال مصلحیان; Mohammad Sal Moslehian
    Year: 2014
    Abstract:

    nonconstant operator monotone function....

    A New Class of Operator Monotone Functions via Operator Means 

    Type: Journal Paper
    Author : Rajinder Pal; Mandeep Singh; محمد صال مصلحیان; Jaspal Singh Aujla; Mohammad Sal Moslehian
    Year: 2016
    Abstract:

    In this paper, we obtain a new class of functions, which is developed via the Hermite--Hadamard inequality for convex functions. The well-known one-one correspondence between the class of operator monotone functions and operator connections declares...

    Operator Ky Fan type inequalities 

    Type: Journal Paper
    Author : S‎. ‎Habibzadeh; J‎. ‎Rooin; محمد صال مصلحیان; S‎. ‎Habibzadeh; ‎J‎. ‎Rooin; Mohammad Sal Moslehian
    Year: 2018
    Abstract:

    )$ is an operator monotone function with $f (1) = 1$‎, ‎$f'(1)=\\mu$‎, ‎and associated mean $\\sigma$‎, ‎then for all operators $A$ and $B$ on a complex Hilbert space $\\mathscr{H}$ such that $0<A,B\\leq\\frac{1}{2}I$‎, ‎we have...

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