On Meromorphic Starlike Multivalent Functions

In this paper we introduce and study some new subclasses of meromorphic starlike multivalentfunctions.Inclusion relations are established,Integral transforms of functions in these classes are alsoconsidered.In particular,our results include or improve several results due to Mogra et al.[2],Mogra[3],Goel and Sohe[4]and Bajpai[5].     

Differential Inequalities and Starlike Functions

We develop sufficient conditions for various types of starlikeness for functions analytic in the unit disk. The problems that we consider are more general than similar problems considered by previous authors. Furthermore we obtain stronger estimates than in earlier works and in several cases sharp ones.     

含有解析函数与亚纯函数的一些不等式

指出文献 [2 ]和文献 [4]中的错误 ,并且得到含有单位圆盘内接解析函数与亚纯函数的几个不等式 .     

亚纯倒星象函数和倒凸象函数类的拟Hadamard卷积

引进了去心圆盘U~*={z:0|z|1}内的亚纯倒星象函数和倒凸象函数的某些新子类,研究了该类中函数的拟Hadamard卷积,所得结果推广了前人的某些工作.     

On Meromorphic Solutions of the Systems of Linear Differential Equations with Meromorphic Coefficients

Ukrainian Mathematical Journal - For systems of linear differential equations whose dimension can be lowered, we estimate the growth of meromorphic vector solutions. As an essentially new feature,...     

关于亚纯函数的唯一性定理

本文研究亚纯函数的唯一性问题,证明的结果与Ｈ．Ｕｅｄａ的一个工作相关。     

Inequalities for Functions with Higher Monotonicities

We consider real functions on [a, b] for which some derivatives have constant sign. For these functions we obtain Popoviciu and Favard-Berwald type inequalities as well as converse Holder inequalities.     

亚纯函数系数微分方程的解和小函数的关系

研究了一类亚纯函数为系数的二阶非齐次线性微分方程的解及其微分多项式和小函数的关系,并得到了这类微分方程解以及解的一阶,二阶导数与微分多项式的不动点性质.     

Complex Interpolation of Nonlinear Operators and Lebedev-Milin Inequalities for Taylor Coefficients of Composed Analytic Functions

A generalization of a theorem of Bergh concerning complex interpolation of nonlinear operators is applied to prove Lebedev-Milin type estimates for Taylor coefficients of composed analytic functions.     

Meromorphic Functions with Two Deficient Values

ＭｅｒｏｍｏｒｐｈｉｃＦｕｎｃｔｉｏｎｓｗｉｔｈＴｗｏＤｅｆｉｃｉｅｎｔＶａｌｕｅｓＸｕＷａｎｓｏｎｇ（徐万松）（ＣｏｌｌｅｇｅｏｆＳｃｉｅｎｃｅｓ，ＮａｎｊｉｎｇＵｎｉｖｅｒｓｉｔｙｏｆＡｅｒｏｎａｕｔｉｃｓａａｄＡｓｔｒｏｎａｕｔｉｃｓ，Ｎａｎｊ...     

Monodromization and Difference Equations with Meromorphic Periodic Coefficients

We consider a system of two first-order difference equations in the complex plane. We assume that the matrix of the system is a 1-periodic meromorphic function having two simple poles per period and bounded as Im z → ±∞. We prove the existence and uniqueness of minimal meromorphic solutions, i.e., solutions having simultaneously a minimal set of poles and minimal possible growth as Im z → ±∞. We consider the monodromy matrix representing the shift-byperiod operator in the space of meromorphic solutions and corresponding to a basis built of two minimal solutions. We check that it has the same functional structure as the matrix of the initial system of equations and, in particular, is a meromorphic periodic function with two simple poles per period. This implies that the initial equation is invariant with respect to the monodromization procedure, that is, a natural renormalization procedure arising when trying to extend the Floquet–Bloch theory to difference equations defined on the real line or complex plane and having periodic coefficients. Our initial system itself arises after one renormalization of a self-adjoint difference Schrödinger equation with 1-periodic meromorphic potential bounded at ±i∞ and having two poles per period.     

Markov- and Bernstein-Type Inequalities for Polynomials with Restricted Coefficients

The Markov-type inequality is proved for all polynomials of degree at most n with coefficients from {-1,0,1} with an absolute constant c. Here ·[0,1] denotes the supremum norm on [0,1]. The Bernstein-type inequality is shown for every polynomial p of the form The inequality is also proved for every analytic function p on the open unit disk D that satisfies the growth condition      

Limit Theorems for Stochastic Variational Inequalities with Non-Lipschitz Coefficients

Potential Analysis - We establish various limit theorems for one-dimensional stochastic variational inequalities with Yamada-Watanabe type conditions on the coefficients, including, the...     

Inequalities for Rational Functions

A new hyperbolic area estimate for the level sets of finite Blaschke products is presented. The following inversion of the usual Sobolev embedding theorem is proved:

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Hereris a rational function of degreenwith poles outside . This estimate implies a new inverse theorem for rational approximation of analytic functions with respect to areaL^pnorm.     

Paley Type Inequalities for Orthogonal Series with Vector-Valued Coefficients

We investigate the extension to Banach-space-valued functions of the classical inequalities due to Paley for the Fourier coefficients with respect to a general orthonormal system Φ. This leads us to introduce the notions of Paley Φ-type and Φ-cotype for a Banach space and some related concepts. We study the relations between these notions of type and cotype and those previously defined. We also analyze how the interpolation spaces inherit these characteristics from the original spaces, and use them to obtain sharp coefficient estimates for functions taking values in Lorentz spaces.     

亚纯函数的唯一性

§ 1.　Introduction　　Inthispaper,unlessspecified ,allthefunctionsarenonconstantmeromorphicfunctions.WeshallusethestandardnotatiosofNevanlinnatheoryofmeromorphicfunctionssuchasT(r,f) ,m(r ,f) ,N(r ,f) , N(r,f) ,… .SetE(r ,f) =∪α∈S{z｜f(z) -a},whereaze ropointwithmultiplicitymiscountedmtimesintheset.AsetSsuchthatforanytwonon constantentirefunctionsf(z)andg(z)theconditionE(S ,f) =E(S ,g)impliesf≡ giscalledauniquerangesetsofentirefunctions.In 1 976,GROSSF [1 ]askedthefollowingquesti…     

Inequalities for Cyclic Functions

The nth cyclic function is defined by

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We prove that if k is an integer with 1kn−1, then

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holds for all positive real numbers x with the best possible constantsα=1 and β= 2n-k over n.     

Certain Convolution Operators for Meromorphic Functions

Let (p N) be the class of functions analytic in 0 < |z| < 1. A convolution operator L_p(a, c) on p is introduced. This paper gives some sharp inequalities for f(z) satisfying Re{(1 – )z^pL_p(a, c) f(z) + z^pL_p(a + 1, c) f(z)} > , where 0, < 1, a > 0 and c 0, –1, –2,....AMS Subject Classification (1991) 30C45 30A10