简介:Foranentirefunctionf(z),letM(f,r)=maxisapolynomialofdegreen,then,ingeneral,itisdifficulttoobtainalowerboundfarM(p’,1).Butifthezerosofthepolynomialareclosetotheorigin,thenvariouslowerboundsforM(p’,1)havebeenobtainedinthepast.Inthispaper,wehaveconsideredpolynomialshavingalltheirzerosin,withapossiblezerooforderm(m>0)attheoriginandhaveobtainedalowerboundforM(p’,1),whichisbetterthanmostoftheknownlowerbounds.Ourboundissharpform=0.
简介:Thef(x)∈C[-1,1]isgiven,amodificationisgiventotheinterpolationpolynomialQn(f;x)(thepower,lessthanλn,1
简介:Denotebyn(f)thedegreeofcopositiveapproximationtof(x)bypolynomialsofdegree≤n.Forfunctionf(x)∈Ck[-1,1]whichalternatesinsignfinitelymanytimesin[-1,1],theauthorobtainsthefollowingJacksontypeestimatesn(f)≤Cn-kw(fk,1/n)foaanypositiveintegerk.
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简介:在这份报纸,作者计算同类的Grushin泛音函数的空格的尺寸,并且给他们的一个直角的基础。而且,作者描述这些同质的Grushin泛音基础的节的曲线。作为直角的基础的一个应用程序,作者为Grushin操作符证明一条Liouville类型定理,那是Grushin泛音函数如果如此的一个函数的频率等于某常数,是同类的多项式。
简介:LetP(z)beapolynomialofdegreenandforanycomplexnumberα,letDαP(z)=nP(z)+(α-z)P′(z)denotethepolarderivativeofP(z)withrespecttoα.Inthispaper,weobtaincertaininequalitiesforthepolarderivativeofapolynomialwithrestrictedzeros.Ourresultsgeneralizeandsharpensomewell-knownpolynomialinequalities.
简介:ByusingthegeneralizedPoincaréindextheoremitisprovedthatifthen^2criticalpointsofann-polynomialsystemformaconfigurationoftype(2n-1)-(2n-3)+(2n-5)-…+(-1)^n-1,andthe2n-1outmostanti-saddlesformtheverticesofaconvex(2n-1)-polygon,thenamongthese2n-1anti-saddlesatleastonemustbeanode.
简介:Inthepresentpaperweconsiderquarticpiecewisepolynomialforapproximationtothefunctionf∈C2[0,1].Aconvextypeconditionhasbeenimposedinthepartitionsothatthematrixinvolvedforthecomputationofppfunctionsisoflowerband.Thisreducesthecomputationforconstructionsoftheppfunctionsfortheapproximation.
简介:AmethodconstructinqC~1Piecewisequinticpolynomialoveratriangulargridtointerpo-latefunctionvaluesandpartialderivativesatverticesispresentedinthispaper.Thesetofprecisepoly-nomialsofthismethodisdiscussed.
简介:在这篇论文,关于伯恩斯坦多项式的新不平等的一个班被建立。与这些,不平等,高度的评价,Beziercurves的衍生物界限和合理Bezier曲线能极大地被改进。
简介:<正>Propertiesofcontinuoussolutionsofasecondorderpolynomial-likeiteratedfunctionalequationaregivenbyconsideringitscharacteristic.Ausefulmethodtodiscussthegeneralcaseisdescribedindeedinthisprocedure.
简介:在这篇文章,基于最不方形的评价,为间接学习结构predistorter的一个递归的算法被介绍。模拟结果显示出所有多项式predistorter的非线性的术语,高顺序(比7th顺序高)非线性的术语是那么次要的他们能在实际predistorter被省略设计。那么,与高顺序的多项式构造predistorter是不必要的,并且算法将总是是稳定的。进一步的结果证明甚至当15th顺序多项式模型被使用时,算法在10次重复以后是会聚的,并且它能由64dB改进20MHz带宽信号的外面乐队光谱,与一1.2???????????????儠卯吗??