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CHARACTERIZATIONS OF GENERAL CONVEX FUNCTIONS

机译:一般凸函数的特征

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摘要

Well known that are G.H. Hardy, J.E. Littlewood and G. Polya proved in 1929 the majorization principle for convex functions. In this paper we consider and give a new principle of majorization for general convex functions. The following result is proved: Let J is contained in R be an interval, let x_i, y_i ∈ J (i = 1,..., n) be real numbers such that fulfilling (5) x_1 ≥ … ≥ x_n, y_1 ≥ … ≥ y_n, x_i ≠ y_i(i = 1,..., n), (6) ∑_(i = 1)~k y_i ≤ ∑_(i = 1)~k x_i (k = 1,..., n - 1), ∑_(i = 1)~n x_i = ∑_(i = 1)~n y_i. If f : J → R is a general convex with contact function for some function g : f(J)~2 → R, then the following inequality holds (N) ∑_(i = 1)~n f (y_i) ≤ 2 ∑_(i = 1)~n f(x_i) - n max{f(a), f(b), g(f(a), f(b))}, for some two fixed arbitrary points a, b ∈ J. Conversely, if for some x_i, y_i ∈J (i = 1,...,n) such that (5) holds, inequality (N) is fulfilled for every general convex with contact function f : J → R, then relations (6) hold.
机译:众所周知的是Hardy,J.E。Littlewood和G.Polya于1929年证明了凸函数的主化原理。在本文中,我们考虑并给出了一般凸函数主化的新原理。证明以下结果:令J包含在R中为一个间隔,令x_i,y_i∈J(i = 1,...,n)为实数,使得满足(5)x_1≥…≥x_n,y_1≥ …≥y_n,x_i≠y_i(i = 1,...,n),(6)∑_(i = 1)〜k y_i≤∑_(i = 1)〜k x_i(k = 1,.. 。,n-1),∑_(i = 1)〜n x_i = ∑_(i = 1)〜n y_i。如果f:J→R是具有某些函数g:f(J)〜2→R的接触函数的一般凸面,则以下不等式成立(N)∑_(i = 1)〜nf(y_i)≤2 ∑ _(i = 1)〜nf(x_i)-n max {f(a),f(b),g(f(a),f(b))},对于某些两个固定的任意点a,b∈J相反,如果对于某个x_i,y_i∈J(i = 1,...,n)使得(5)成立,则对于具有接触函数f的每个一般凸面,满足不等式(N):J→R,则关系(6)按住。

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