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B值弱Hardy两指标鞅空间的原子分解
Vo1.29(20O9) 数 学 杂 志
NO.2 J.ofMath.(PRC)
AToM IC DECoM PoSITIoNSoF TW o—PARAMETER
WEAK HARDY SPACESoF BANACH—VALUED
MARTINGALES
M A Tao
(SchoolofMath.andStatistics,WuhanUniversity,Wuhan430072,China)
Abstract:In thispaper。westudyatomicdecompositionsfortwo-parameterweak Hardy
spacesofBanach—valuedmartingales.Usingthetechniqueofatomicdecompositions,weobtain
embedding relationship between two-parameterweak Hardy spaces ofB-valued martingales.
Herethe resultsareconnected with thegeometry properties ofBanaeh spaces in which the
martingalestakevalues.
Keywords:tw-oparameterB-valuedmartingale;atomicdecomposition;weakHardyspace
2000MRSubjectClassification:60G42;43A17
Documentcode:A ArticleID:0255-7797(2009)02-0119-06
1 Introduction
Themethodoftheatomicdecompositionplaysanimportantroleinmartingaletheory.
Themethod WasfirstintrodueedbyC.Herz[¨.F.W eisz[,胡 extended themethod and
obtained a series of important martingale inequalities and duality theorems in the
scalar—valued. Liu, Hou and YuE,s] investigated the atomic decompositions of
Banach—valuedmartingalespaceswith smallindex.W eisz[]introduced akindofweak
Hardyspaceofmartingalesandgavethecorrespondingatomicdecompositiontheoremsin
thescalar—valuedcase.ThemethodofatomicdecompositionswasextendedtoB-valued
weakMartingaleHardy spacesinMaandLiu[ W ewillconsideratomicdecompositions
.
fortwo—parameterB—valuedweakmartingaleHardyspacesin thispaper.
OnthesetN。weconsiderthepartialorderm≤ ifm1≤nlandm2≤n2,where
m= ( 1,m2)andn一 (nI,n2).Wealsosay thatm n if ≤ nandm≠ n,m 《n
if,l land 2 -//2.m andn issaid tobe incomparableifneitheroftheinequalities
m andn hold.Andfo
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