简介：让x：Mn是有非零主管弯曲的脐的免费hypersurface。然后，x与Laguerre公制的g被联系，Laguerre张肌\mathbbL\mathbb{L}，Laguerre形式C，和一个Laguerre秒基础形成\mathbbB\mathbb{B}它是在Laguerre下面的x的invariants转变组。如果它的Laguerre形式消失，hypersurfacex被称为Laguerreisoparametric并且\mathbbB\mathbb的特征值{B}是不变的。在这份报纸，我们在4分类所有Laguerreisoparametrichypersurfaces。

简介：Wegiveanestimateoftypesup×infonRiemannianmanifoldofdimension4foraYamabetypeequation.

简介：InthisarticlethespectrumofsupportsizesofacompletelydecomposableTS(ν,,4)foranypositiveintegerν≡1,3(mod6)isdetermined.

简介：设(M,T)是一个光滑闭流形上的对合,不动点集为F=RP(4)UP(4,2n-1),则它的每一个对合(M,T)必协边(RP(4)×RP(4),twist)和(P(4,2n),T')之一.

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简介：Thispapergivesaclassificationofcompletehypersurfaceswithnonzeroconstantmeancurvatureandconstantquasi-Gauss-KroneckercurvatureinthehyperbolicspaceH4(-1),whosescalarcurvatureisboundedfrombelow.

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简介：<正>InthispaperwestudysurfacesinS~4andtheirtwistorGaussmaps.SomenecessaryandsufficientconditionsthatthetwistorGaussmapisharmonicaregiven.Wefindmanyexamplesofnonisotropicharmonicmapsfromasurfaceto(?)P~3.

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简介：Themainresultsareasfollows.

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简介：本文介绍了一个引理,这个引理奠定了K4-同胚图K4(α,1,1,δ,ε,η)色性研究的基础.

简介：证明了相协样本下密度函数的核估计在有限个不同点上的联合渐近分布为多维正态分布．

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简介：LetMbeapositivequaternionicKhlermanifoldofdimension4m.Wealreadyshowedthatifthesymmetryrankisgreaterthanorequalto[m/2]+2andthefourthBettinumberb_4isequaltoone,thenMisisometrictoHP~(m).Thegoalofthispaperistoreportthatwecanimprovethelowerboundofthesymmetryrankbyoneforhighereven-dimensionalpositivequaternionicKahlermanifolds.Namely,itisshowninthispaperthatifthesymmetryrankofMwithb_4(M)=1isgreaterthanorequaltom/2+1form≥10,thenMisisometrictoHP~m.OneofthemainstrategiesofthispaperistoapplyamoredelicateargumentofFrankeltypetopositivequaternionicKhlermanifoldswithcertainsymmetryrank.

简介：Inthispaper,acompleteclassificationofarc-transitivecubicgraphsoforder4pisgiven.

简介：Assumethatm≥2,pisaprimenumber,(m,p(p-1))=1,-1(Z/mZ)~*and[(Z/mZ)~*:]=4.Inthispaper,wecalculatethevalueofGausssumG(X)=Σ_(x∈F_q~*)x(x)ζ_p~(T(x))overF_q,whereq=p~f,f=((m))/4xisamultiplicativecharacterofF_qandTisthetracemapfromF_qtoF_p.Underourassumptions,G(x)belongstothedecompositionfieldKofpinQ(ζm)andKisanimaginaryquarticabeliannumberfield.WhentheGaloisgroupGal(K/Q)iscyclic,wehavestudiedthiscycliceaseinanotherpaper:'Gausssumsofindexfour:(1)cycliccase'(acceptedbyActaMathematicaSinica,2003).Inthispaperwedealwiththenon-cycliccase.

简介：At-hyperwheel(t≥3)oflengthl(orW(t)lforbrevity)isat-uniformhypergraph(V,E),whereE={e1,e2,...,el}andv1,v2,...,vlaredistinctverticesofV=∪eii=1lsuchthatfori=1,...,l,vi,vi+1∈eiandei∩ej=P,j∈/{i1,i,i+1},wheretheoperationonthesubscriptsismodulolandPisavertexofVwhichisdifferentfromvi,1≤i≤l.Inthispaper,theminimumcoveringproblemofMCλ(3,W(3)4,v)isinvestigated.DirectandrecursiveconstructionsonMCλ(3,W(3)4,v)arepresented.Thecoveringnumbercλ(3,W(3)4,v)isfinallydeterminedforanypositiveintegersv≥5andλ.

简介：相关函数表现出时间序列中任意两个值之间的相关性是如何随着时间间隔而改变的．自相关函数刻画了时间序列相邻变量之间的相关性，偏相关函数则是排除了其它中间变量的影响，真实地反映两个变量之间的相关性，并且二者紧密相连．同时两个相关图所反映的信息在时间序列分析各个方面发挥着关键作用．