On some inequalities for Doob decompositions in Banach function spaces

On some inequalities for Doob decompositions in Banach function spaces
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DOI:
10.1007/s00209-009-0546-3
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发表时间:
2010-08
影响因子:
0.8
通讯作者:
M. Kikuchi
M. Kikuchi
中科院分区:
数学2区
文献类型:
--
作者:
M. Kikuchi

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让 是一个杨函数,让 是一个鞅,这样对于所有人来说。然后该过程可以被唯一地分解为,其中 是鞅并且是可预测的非递减过程,使得 h0= 0 几乎肯定。主要结果描述了那些不等式有效的Banach函数空间X和不等式有效的那些X,其中Mf和Sf分别表示极大函数和平方函数off。
Letbe a Young function and letbe a martingale such thatfor all. Then the processcan be uniquely decomposed as, whereis a martingale andis a predictable nondecreasing process such thath0= 0 almost surely. The main results characterize those Banach function spacesXsuch that the inequalityis valid, and thoseXsuch that the inequalityis valid, whereMfandSfdenote the maximal function and the square function off, respectively.