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Square function inequalities for non-commutative martingales

机译:非交换mar的平方函数不等式

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摘要

We prove a non-commutative version of the weak-type (1, 1) boundedness of square functions of martingales. More precisely, we prove that there is an absolute constant K with the following property: if M is a semifinite von Neumann algebra with a faithful normal trace T and (M-n)(n=1)(infinity) is an increasing filtration of von Neumann subalgebras of M then for any martingale x = (x(n))(n=1)(infinity) in L-1(M, tau), adapted to (M-n)(n=1)(infinity), there is a decomposition into two sequences (x(n))(n=1) and (z(n))(n=1)(infinity) with x(n) = y(n) + z(n) for every n greater than or equal to 1 and such thatparallel to(Sigma(n=1)(infinity)dy(n))(1/2) parallel to(1, infinity) +parallel to(Sigma(n=1)(infinity))dz(n)(2)parallel to(1, infinity) less than or equal to Kparallel toxparallel to(1)This generalizes a result of Burkholder from classical martingale theory to non-commutative martingales. We also include some applications to martingale Hardy spaces.
机译:我们证明了mar的平方函数的弱类型(1,1)有界的非交换形式。更确切地说,我们证明存在一个具有以下性质的绝对常数K:如果M是具有忠实法线迹线T的半有限冯诺伊曼代数,并且(Mn)(n = 1)(无穷大)是冯诺伊曼的递增滤光M的子代数然后对于任何any x =(x(n))(n = 1)(无穷大)在L-1(M,tau)中,适应于(Mn)(n = 1)(无穷大),分解为两个序列(x(n))(n = 1)和(z(n))(n = 1)(无穷大),其中x(n)= y(n)+ z(n)每大于n等于1并等于(Sigma(n = 1)(无穷大) dy(n))(1/2)平行于(1,无穷大)+平行于(Sigma(n = 1)(无穷大) ) dz(n)(2)平行于(1,无穷大)小于或等于Kparallel平行于(1)平行于(1)这将Burkholder的结果从经典theory理论推广到非交换mar。我们还包括一些用于mar Hardy空间的应用程序。

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