关于亚纯函数的奇异方向

本文讨论了无穷级亚纯函数结合导数涉及重值的奇异方向,得出如下结果:定理 设f(z)为|z|<∞中的亚纯函数,其级ρ(r)为熊庆来无穷级,则必存在从原点发出的半直线 B:arg z=θ_0(0≤θ_0<2π)具有如下性质:对于任意的正整数 l,p,k;任意的正数 ε 及一切有穷复数 α,β(β≠0),若((2+1/k)(k+2)-2)/l+((2+2/k)(k+1))/p<1,则有(?)(log{(?)_(l-1)(r,θ_0,ε,f=α)+(?)_(p-1)(r,θ_0,ε,f~((k))=β))/(ρ(r)logr)=1     

整函数与亚纯函数的亏值、渐近值和茹利雅方向的关系的研究

本文主要论证了亏值、渐近值和茹利雅方向三者之间的关系,得到下述结果: 1.设f(z)是下级μ为有穷的整函数.记f(z)的茹利雅方向个数为q,有穷判别渐近值个数为l,有穷亏值个数为p,其中l′个亏值同时是渐近值,则有关系式 2p-l′+l≤q. 如果进一步假设 2p-l′+l=q<+∞,则有p=l′和λ=μ,其中λ是f(z)的级. 2.设w=f(z)是下级μ为有穷的亚纯函数.记f(z)的茹利雅方向个数为q,f(z)的反函数z=g(w)的判别直接超越奇点个数为l,f(z)的亏值个数为p,其中l′个亏值同时是g(w)的直接超越奇点,则有关系式 p-l′+l≤g. 如果进一步假设 p-l′+l=q<+∞,以及0<μ≤λ<+∞,其中λ是f(z)的级,则f(z)的每个亏值同时是渐近值.     

限定Borel点的亚纯函数

设E是任意一个非空的闭实数集(mod 2π),ρ(θ)是E上一个上半连续的有界正值函数(0<ρ(θ)相似文献   

CAUCHY PROBLEM FOR LINEARIZED SYSTEM OF TWO-DIMENSIONAL ISENTROPIC FLOW WITH AXISYMMETRICAL INITIAL DATA IN GAS DYNAMICS

§1IntroductionIn the present paper,we are interested in solving the Cauchy problem for linearizedsystem of two-dimensional isentropic flow with initial data in gas dynamicsρt+ρ0xu+yv=0,ut+p′(ρρ00)xρ=0,vt+p′(ρ0ρ0)yρ=0,(1.1)t=0:(ρ,u,v)=(ρ0(r),u0(r),v0(r)),(1.2)whereρis the density,(u,v)is the velocity,ρ0is a positive constant,p=p(ρ)is theequation of state satisfying p′(ρ0)>0,(r,θ)is the polar coordinate such thatx=rcosθ,y=rsinθ,0≤r<+∞,0≤θ≤2π…     

关于亚纯函数的Hayman方向

定义1 设 f(z)为开平面上ρ(0≤ρ<+∞)级亚纯函数。B:argz=θ_0(0≤θ_0<2π)为原点出发的直线。若对任意正整数 l,任意正数ε,及任意两个有穷复数 a,b(b≠0)(?)(log+{n(r,θ,ε,f=a)+n(r,θ_0,ε,f~(l)=b)})/log     

关于亚纯函数与其各级导数的反函数的直接超越奇点

本文证明了下述结果: 设f(z)是一个ρ级亚纯函数。记f(z)的i级导数,f⁽ⁱ⁾(z)(f^(O)(z)=f(z)的反函数的判别有穷非零直接超越奇点个数为pi,则当ρ≥1时,有和当0≤ρ<1时,有p≤1。     

关于亚纯代数体函数奇异方向的存在性

本文证明了如下结果:对于有穷正级亚纯代数体函数,一定存在一条奇异方向L∶arg z=θ0(0≤θ0＜2π),使得对于任意δ∈(0,π/2),在角域Δ(θ0,δ)内,对任意复数a,对任意ε＞0,有∑i1|zi(a;Δ(θ0,δ))|σ=∞(σ等于ρ或ρ-ε)至多有2v个例外a值.     

关于代数体函数Borel方向的一个结果

本文证明了下列定理设w=w(z)为|z|<∞上的υ值代数体函数,它的级满足0<ρ<∞,则存在一条方向Largz=θ     

亚纯函数的零点和极点的分布与充满圆

本文主要结果的含意是:设f(z)为ρ(0<ρ<∞)级亚纯函数,且在角域D上以0和∞为Borel例外值,若在D内一列趋于∞的弧段上,f^(l)(z)(l≥0)充分接近于一有穷非零复数,则在这列弧段附近,f^(l)(z)不存在ρ级充满圆。这个结果可用以估计亚纯函数及其各级导数的亏值数目。     

关于多项式系数的整除性

设n是正整数,k1,k2,…+k1=n的非负整数,正整数[nk1k2…ks]=n！/k1!k2!…k5!称为多项式系数,本文讨论了当n=a0+a1p+a2p^2+…arp^r,其中p为素数且p≤n,0≤ai&;lt;p(0≤i≤r);ki=a0^(i)+a1^(i)p+…+ar^(i)p^r,其中ki≤0,∑^si=1,ki=n,0≤ak^(i)p(0≤i&;lt;s)时多项式系数的整除性问题,得出的结果推广了著名的Lucas定理^[1].     

一类高阶线性微分方程解的复振荡

In this paper,we shall use Nevanlinna theory of meromorphic functions to investigate the complex oscillation theory of solutions of some higher order linear differential equation.Suppose that A is a transcendental entire function with ρ(A)<1/2.Suppose that k≥2 and f(k)+A(z)f=0 has a solution f with λ(f)<ρ(A),and suppose that A1=A+h,where h≡0 is an entire function with ρ(h)<ρ(A).Then g(k)+A1(z)g=0 does not have a solution g with λ(g)<∞.     

Properties of Complex Oscillation of Solutions of a Class of Higher Order Linear Differential Equations

Let A(z) be an entire function with μ(A) 1/2 such that the equation f~((k))+A(z)f = 0, where k ≥ 2, has a solution f with λ(f) μ(A), and suppose that A_1 = A+h,where h■0 is an entire function with ρ(h) μ(A). Then g~((k))+ A_1(z)g = 0 does not have a solution g with λ(g) ∞.     

涉及分担函数的正规定则

设k为正整数,M为正数;F为区域D内的亚纯函数族,且其零点重级至少为k;h为D内的亚纯函数(h(z)≠0,∞),且h(z)的极点重级至多为k.若对任意给定的函数f∈F,f与f~((k))分担0,且f~((k))(z)-h(z)=0?|f(z)|≥M,则F在D内正规.     

DECOMPOSITION OF BMO FUNCTIONS AND FACTORIZATION OF $\[{A_p}\]$ WEIGHTS IN MARTINGALE SETTING

Let $\[(\Omega ,F,\mu )\]$ be a probabilty space with an increasing family $\[{\{ {F_t}\} _{t > 0}}\]$ of sub-fields satisfying the usual conditions. The following results are obtained: for $\[f \in BMO\]$, we have $\[f = g - h\]$ with $\[g,h \in BLO\]$; if in addition, f satisfies then for $\[s > 0\]$ arbitrary, g,h can be chosen such that $\[g,h \in BLO\]$, and $$\[E({\varepsilon ^{(a - \varepsilon )(g - {g_t})}}|{F_t}) \le {C_{a,\beta ,\varepsilon }},E({\varepsilon ^{(\beta - \varepsilon )(h - {h_t})}}|{F_t}) \le {C_{a,\beta ,\varepsilon }}\]$$ and for weights z, we have $\[z \in {A_p} \cap S \Leftrightarrow z = {z_1}z_2^{1 - p}\]$ with $\[{z_i} \in {A_i} \cap S,i = 1,2\]$, where $\[S = \{ \begin{array}{*{20}{c}} {weight}&{z:C{z_{{T^ - }}} \le {z_T} \le C{z_{{T^ - }}}} \end{array}\} \]$, $\[\forall \]$ stopping times T, outside a null set }.     

Cn中单位球上$mu$-Bloch函数的等价刻画

设$\mu$是$[0,1)$上的正规函数, 给出了${\bf C}^{\it n}$中单位球$B$上$\mu$-Bloch空间$\beta_{\mu}$中函数的几种刻画. 证明了下列条件是等价的: (1) $f\in \beta_{\mu}$; \ (2) $f\in H(B)$且函数$\mu(|z|)(1-|z|^{2})^{\gamma-1}R^{\alpha,\gamma}f(z)$ 在$B$上有界; (3) $f\in H(B)$ 且函数${\mu(|z|)(1-|z|^{2})^{M_{1}-1}\frac{\partial^{M_{1}} f}{\partial z^{m}}(z)}$ 在$B$上有界, 其中$|m|=M_{1}$; (4) $f\in H(B)$ 且函数${\mu(|z|)(1-|z|^{2})^{M_{2}-1}R^{(M_{2})}f(z)}$ 在$B$上有界.     

Positive Gegenbauer Polynomial Sums and Applications to Starlike Functions

Let $s_n(f,z):=\sum_{k=0}^{n}a_kz^k$ be the $n$th partial sum of $f(z)=\sum_{k=0}^{\infty{}}a_kz^k$. We show that $\RE s_n(f/z,z)>0$ holds for all $z\in\D,\ n\in\N$, and all starlike functions $f$ of order $\lambda$ iff $\lambda_0\leq\lambda<1$ where $\lambda_0=0.654222...$ is the unique solution $\lambda\in(\frac{1}{2},1)$ of the equation $\int_{0}^{3\pi/2}t^{1-2\lambda}\cos t \,dt=0$. Here $\D$ denotes the unit disk in the complex plane $\C$. This result is the best possible with respect to $\lambda_0$. In particular, it shows that for the Gegenbauer polynomials $C_{n}^{\mu}(x)$ we have $\sum_{k=0}^n C_{k}^{\mu}(x)\cos k \theta>0$ for all $n\in\N,\ x\in[-1,1]$, and $0<\mu\leq\mu_0:=1-\lambda_0=0.345778...$. This result complements an inequality of Brown, Wang, and Wilson (1993) and extends a result of Ruscheweyh and Salinas (2000).     

Hardy-Sobolev类上的Bohr型不等式

Let β 〉 0 and Sβ ：= {z ∈ C ： ｜Imz｜ 〈β} be a strip in the complex plane. For an integer r ≥ 0, let H∞^Г,β denote those real-valued functions f on R, which are analytic in Sβ and satisfy the restriction ｜f^（r）（z）｜ ≤ 1, z ∈ Sβ. For σ 〉 0, denote by Bσ the class of functions f which have spectra in （-2πσ, 2πσ）. And let Bσ^⊥ be the class of functions f which have no spectrum in （-2πσ, 2πσ）. We prove an inequality of Bohr type
‖f‖∞≤π/√λ∧σ^r∑k=0^∞（-1）^k（r＋1）/（2k＋1）^rsinh（（2k＋1）2σβ）,f∈H∞^r,β∩B1/σ,
where λ∈（0,1）,∧and ∧′are the complete elliptic integrals of the first kind for the moduli λ and λ′=√1- λ^2,respectively,and λ satisfies
4∧β/π∧′=1/σ.
The constant in the above inequality is exact.     

分担值与正规族

设F是平面区域D上的亚纯函数族,a,b是两个有穷非零复数.如果■ff∈F,f(z)=a■f~((k))(z)=a,ff~((k))(z)=b■f~((k+1))(z)=b,且f-a的零点重数至少为k(k≥3),那么函数族F在D内正规;当k=2时,在条件a≠4b的情况下,同样有函数族F在D内正规.     

一类n-阶m-点奇异边值问题的正解

研究n-阶m-点奇异边值问题其中h(t)允许在t=0,t=1处奇异,f(t,v_0,v_1,…,v_(n-2))允许在v_i=0(i=0,1,…,n-2)处奇异.利用锥拉伸与压缩不动点定理得到了上述奇异边值问题正解的存在性.     

一类整函数系数微分方程解的复振荡

本文研究了微分方程f~(k) A_((k-1))f~((k-1)) … A_0f=F(k≥2)解的增长级和零点收敛指数,其中A_j=B_je~(P_j),j=0,1,…,k-1,B_j(z)为整函数,P_j(z)为多项式,σ(B_j)＜degP_j．