简介:在这篇论文,我们由光滑ω_的r-thDitzian-Totik模量为伯恩斯坦操作员的联合在同时的近似上给相等的定理(φ~λ)~r(f,t)(0≤λ≤1)。我们也调查在联合ofBernstein操作符的衍生物和函数的衍生物的光滑之间的关系。
简介:InthepresentpaperweextendpreviousresultsaboutthemonotoaicityofBernstein-typeoperatorsrdtiwetoconvexfunctionsandaboutthepreservationofLipschitzclasses.
简介:DellaVecchiaetal.(see[2])introducedakindofmodifiedBernsteinoperatorswhichcanbeusedtoapproximatefunctionswithsingularitiesatendpointson[0,1]Inthepresentpaper,weobtainakindofpointwiseStechkin-typeinequalitiesforweightedapproximationbythemodifiedBernsetinoperators.
简介:SupposethatwewanttoapproximatefC[0,1]bypolynomialsinPn,usingonlyitsvaluesonXn={i/n,0≤i≤n}.ThiscanbedonebytheLagrangeinterpolantLnfortheclassicalBernsteinpolynomialBnf.But,whenntendstoinfinity,LnfdoesnotconvergetofingeneralandtheconvergenceofBnftofisveryslow.WedefineafamilyofoperatorsBkn,n≥k,whichareintermediateonesbetweenB(0)n=B1n=BnandBnn=Ln,andwestudysomeoftheirproperties.Inparticular,weproveaVoronovskaja-typetheoremwhichassertsthatBknf-f=0(n-[(k+2)/2)forfsufficientlyregular.Moreover,B(k)nfusesonlyvaluesofBnfanditsderivatiesandcanbecomputedbyDeCasteljauorsubdivisionalgorithms.
简介:Letf(x)∈Lp[0,1],00.Denote|f|Λρα=[0,1-kh],k=[α]+1}.If|f|Λρα<∞,wesaythatf∈ΛραYu.A.BrudnyirecentlyestablishedanewinequalityofBer-nsteintypeforrationalfunctions.DenotingRntheclassofrationalfunctionsofdegreen,hegaveTheoremAIfrn∈Rnandp=(α+(1/q))-1with1≦q≦∞,α>0,then
简介:当二项式的系数被一般的代替时,在这份报纸,我们在情况中学习伯恩斯坦操作员的顺序令人满意一条类似的递归的规则。除集中的描述和以这种方式获得的操作符的顺序的近似性质以外,主要应用程序考虑合适的秒顺序的解决方案的近似寓言的问题。
简介:在这份报纸,我们估计了伯恩斯坦2l广告justed插值多项式操作员的标准,并且证明评价是锋利的。
简介:Inthisworkweslwlylinearpolynomialoperatorspreservingsomeconsecutivei-convexitiesandleavingin-verantthepolynomtalsuptoacertaindegree.Firstwestudytheexistenceofanincompatibilitybetweentheconservationofcenaini-cotivexitiesandtheinvarianceofaspaceofpolynomials.InterpolationpropertiesareobtainedandatheorembyBerensandDcVoreabouttheBernstein’soperatortsextended.Finally,fromtheseresultsagenera’izedBernstein’soperatorisobtained.
简介:对Bernstein-Fan算子进行推广,并在此基础上进一步探讨其一致收敛性以及导数与连续模之间的关系。
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简介:TheConchy’sformulaofentirefunctionsf:Ck→CisusedtoestablishMarkov-Bernsteintypeinequalitiesofmuhivariatepolynomialswithpositivecoefficientsonthek-dimensionalsimplexTkRkandonthecube[0,1]k.ThemainresultsgeneralizeandimprovethoseofG.G.Lorentz,etc.Someapplicationsofthesemequaltiesarealsoconsideredinpolynomialconstrainedapproximation.