一类三角多项式算子的饱和定理

1.设(从、)。,。夯;是一个下三角形矩阵,又设f(x)任X劣二,其Fourier级数为 沙、匀s〔f〕一专a。+艺“a孟eoskx+“,s‘nkx,一艺A*(x,1)定义三角多项式算子: 左一0 伫T:(f,x)一艺‘。A,(x,, 走.0其中入.。“1 月.易见:。(f,二卜(f来二:)(x),这里二,(x)一艺‘。 k=0cos无x.显然地,ZH,(k)=(0镇k(n) H(k)一。(k>动.所以,对任何k〔N,有1一ZH:(k)二l一入。*. 「 }乞己“,‘中乏,一}“任兀‘· L(i)存在g〔L穿,,使g(k)二中‘f(k),1相似文献   

关于厄米阵特征值之和的一个不等式及其应用

1.如果A是。x。厄米阵,那末A的特征值记为入,(A))入:(A)》…)入。(A),前一文〔‘〕中,作者之一证明了如下的不等式(1): 定理〔们如果A和B为半正定。x。厄米阵,那末 入:(B)成饥(这里,,是直线上的Lebesgue测度.U(入‘(A),入‘(A+B))),(1) 利用(1),〔4〕还证明了半亚正常算子的一个不等式,本文的目的是推广并改进(1),得到了一个新的不等式并将它应用于非正常算子. 2.定理I如果A和B是。x。厄米阵,那末 ‘!‘A+B)+鑫“夕一‘A+B,)‘·‘B,+欺‘一‘B,+熟“,‘A,+‘·‘A,,‘2,这里。<‘,<落:<…<感,<。. 我们注意,如果夕=。一1,不等式(…     

单叶函数相邻两系数模之差

芍1设函数,(二卜:+艺a洛·。s,及f^(二卜Z+名b二幸;Zff+,〔S*。在〔i〕,〔2〕,及〔3〕分别证明。(1·1)1、二,一}一、!、A‘。93‘2一2,3,…(1·2,1}。::;卜、。:‘、}1《,一,:‘:一”109·,一2,3…。此地*=2,3,,为常数。 本文目的在改进(1·3)1!一}一,二,〔11〕,〔12〕《Alog‘+‘n.n=2,3…;‘,·‘,!,“““,,一,”“。)!1、,一“一,’{,。g。)““5一于,二 n=2,3,…,k=2,3。。>0,A为与!有关的常数。荟2,证明前先述证一些引理:引理一,若j(z)〔S,则(2·1卜等军一!,(二川《立子丝!,(。一)!,。、。《·<1引理二,若f(习〔S,则,。。、产’}…     

方幂和直接计算公式

本文给出如下一类方幂和。一幻开(d;k+j+“一‘) 门矛l了1…l开(“‘+,+,,一‘,璐’禽一0J止一1直接计算公式.引理设二:,:、为正整数(:一1,2,…,:)M二艺成.则有.1,+里乏(一:),灸芝(一1)畜(拢+l乏(尤2一i)爪‘(x:一i)”2…(劣‘一i)m‘=0(1)拼+l沉1艺A:(x卜‘”‘-‘.0 州211【艺,,么“:一‘,·,一,耍 j么一0一r盯t、1/1=0 、 mt1艺F!:(:‘一‘,’ j公.0!一l一0(2)附+1证明1)乏(一1)!(m+l)(X:一‘,丫‘…‘X一‘,盆一0八针引引创、少r,+Im1!艺(一‘)叉‘一‘”:(优+l艺(一,,』1(州夏)x:”‘一”‘」‘}12一0):2·,一注‘三卜l叉(一1,了‘(…     

有关multiply from k=1 to n(1+x_k)的几个不等式及其推广

设x:、’二二,。“十(正实数集),记‘I、(劣)套告乏二·,口。(·,匀、云下妥二H·(二)丘01垒,:设劣:,…,x:任R、,则〔‘+G·(x,〕·、n(‘+x*,、〔‘+A,(x,〕 k一1当且仅当x:二…=劣:时取“二”号。卜、月少犷证。。,、一。、(二)。·、fi〔,、二;,驾逃,In(,十,、二、k一1买 ,.日,上O刀︸、/:主, r d..k仁1令x*“e“专=~合,产,__,1上n仁1十e孟P气— nf*)〕毛1、屯,,,;1..不乙‘n气上+己(A)当且仅当x:=·一x。即t:=·一t。时取“二” k·1而In(l+。)在(一co,+co以格下凸,根据凸函数基本不等式‘”,不等式(A)成立,从而不等式以十G:(劝〕)…     

两个不等式的最优形式

胡克在t’l以及在数学系函数论讨论班的报告中得到如下的不等式:(一)若a,,b,>0,(。二1,2,…),i一c, e。>0,(n,。=i,2,…)P)Q>0,1 .1 .oJ万宁订=工,州:..名二“·、(名“分)去一卡·{(名·‘名“嗜)’一(买·‘二买“分一名·:买“分二)’}命.(二)若b。》0,(k=O,1,…,,),1一Cr C,>0,(了,j二0,,“(客6,占一)’‘(客吞:)’一(客右:(一)’ 自然,(一)和(二)均是万。lde:不等式的拓广。胡克于1979年8月在全国亚纯函数与复变函数几何理论学术交流会上宣读结果(一)时闭,因为不等式中含有可以自由变化的C。,于是当时就有同志提出是否有一个(一)的…     

一个Nishishiraho型的饱和定理

设f(x)〔Xg,(1毛P成。其Fourier级数为S〔f〕一‘一“。 乏 离‘1‘a co,‘x b走s‘nkx,一乏A;(x,并令T、(f,x)二 .艺‘,A孟“,其巾(入,、:,为一下三角形矩阵,而入。一1T.Nishishiraho川在C::空间证得定理N设才甲。乒是一个收敛于零的正实数序列,其满足,.1一入,,l王111一—=K。,.甲,(k~],2,…乏}A:。}一。‘印·其中A一),*一2矢.‘;、1, 入。(、十,少.则{T。}在C:中饱和,且有饱和阶甲。与饱和类{厂〔C:,,f〔L iPI}本文于X犷:空间得到下述的Nishiohiraho型饱和定理定理设{印}是收敛于零的正实数序列.若有,._1一入。,,,11 Jn—一兀…     

关于Jackson不等式

一、引言、卜」 龙给定三角阵、一{、一k=1,2,任.R,\,全(1n=1,2,其中R表实数集,若入满足K·(x,一专+艺‘一:。s‘尤)”,。一‘,2,一则称正.1U.(f,x)_口。2+ 月艺‘:,云一1(a*。。skx+占。si妙x)为f的线性正算子这里f任“:a‘、b。是f的Fourier系数:,一夸+艺‘a舌Cos‘x+“1“‘n‘x’·k~令A分~ SUPf〔c:,max·IU。(f,x)一f(x)If奔c。(f,各。)A乏~SUPmax 1 U.(f,劣)一f(x){f〔e生:,f二等c各,0(f夕,乙。)此处乙.吝0,0(f,t)是f的连续模,。容易看出,A忿,A}IU,(f,劣)一f(二){}努分别是适合不等式C2f任e:及1 IU·(f,x)一f(x)I}。2趁M…     

扩散过程转移函数密度的估计及其应用

1.设D~佃,必:F(劝<好,F是男,,牙中的玩Ps比i加函数。(.,H里(刀))是护(兵间上的正则众ri。址e七空间,其中.(f,。一J。鑫黔警a.,(、应用Djriohle七空间的变换,我们证明了存在对称的,强Feller连续的Markov过程,联系于Did比let空间帆H,(乃))。2.设或者石一丢鑫去内,(劝云十拿v.(劝斋“一告鑫a’,(幻减鼠+拿b’(劝去是是功必其中诚·)有界可测,满足条件入I‘试·)‘犷11,其中入任(o,l〕是常数,b(·)有界可测,设抓,,毛L--扩散的转移密度函数.利用条件扩散,我们证明了 架2t1”(籽孔刃一d,(毛刃 3.设,1各刁__,,__、a约‘万泞,不卿、‘,夕万万…     

具有脉冲的时滞Logistic方程的全局吸引性

考虑具有脉冲的时滞Logistic方程{x‘(t)=r(t)(1-e^x(t-τ))t≥t0，t≠tk，k=1、2……（*）x(t^ k)-x(tk)=bkx(tk)k=1、2……其中τ＞0，r(t)∈C([t0， ∞]，R^ )；-1＜bk≤0；且{tk}满足t0＜t1＜t2＜…＜tk＜…，limtk k→∞= ∞。本文给出了（*）的解是全局吸引的充分条件。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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