简介:LetM^nbeaclosedspacelikesubmanifoldisometricallyimmersedindeSitterspaceSp^(n+p)(c),DenotebyR,HandSthenormalizedscalarcurvature,themeancurvatureandthesquareofthelengthofthesecondfundamentalformofM^n,respectively.SupposeRisconstantandR≤c.ThepinchingproblemonSisstudiedandarigiditytheoremforM^nimmersedinSp^(n+p)(c)withparallelnormalizedmeancurvaturevectorfieldisproved.Whenn≥3,thepinchingconstantisthebest.Thus,themistakeofthepaper“Space-likehypersurfacesindeSitterspacewithconstantscalarcurvature”(seeManusMath,1998,95:499-505)iscorrected.Moreover,thereductionofthecodimensionwhenM^nisacompletesubmanifoldinSp^(n+p)(c)withparallelnormalizedmeancurvaturevectorfieldisinvestigated.
简介:Isospectralandnon-isospectralhierarchiesrelatedtoavariablecoefficientPainlev′eintegrableKorteweg-deVries(KdVforshort)equationarederived.Thehierarchiesshareaformalrecursionoperatorwhichisnotarigorousrecursionoperatorandcontainstexplicitly.Bythehereditarystrongsymmetrypropertyoftheformalrecursionoperator,theauthorsconstructtwosetsofsymmetriesandtheirLiealgebrafortheisospectralvariablecoefficientKorteweg-deVries(vcKdVforshort)hierarchy.
简介:Aclassofmetric,compact,andtotallydisconnectedspaces,calledself-similarCantorsetsisintroduced.Aself-similarstructureisdefinedtobeagraphwithweightededges.Theintroductionofultrametricsandquasi-isometriesgivesversatilitytothisconstruction.Thermodynamicalfunctionsasfreeenergyandentropyareassociatedwithself-similarstructures.Multifractalanalysis,basedona“LargeDeviations”inequalityandGibbsmeasures,leadstoafairlygeneralHausdorffdimensiontheorem.
简介:本文旨在给出Banach空间值Hardy—Lorentz鞅空间的共轭空间的完全刻画.首先,对B值鞅引入了一类新的广义Lipschitz鞅空间及“原子鞅”的概念;其次,对B值Hardy-Lorentz鞅空间建立了“原子鞅”的分解定理;最后,以此为工具证明了其共轭空间是广义Lipschitz鞅空间.所得结论将已有的相应结果由实值鞅推广到Banach空间值鞅的情况.
简介:研究D-Cchang等人引进的五个区域Hardy空间,刻划这些空间的原子分解和对偶空间,揭示了这些空间的内在联系。