Doob's inequality for non-commutative martingales

Details Doob's inequality for non-commutative martingales Doob's inequality for non-commutative martingales

2002-06-06

arxiv.org/abs/math/0206062v1

Mathematics

Operator Algebras

Scientific paper

Let $1\le p<\8$ and $(x_n)_{\nen}$ be a sequence of positive elements in a non-commutative $L_p$ space and $(E_n)_{\nen}$ be an increasing sequence of conditional expectations, then the $L_p$ norm of \sum_n E_n(x_n) can be estimated by c_p times the $L_p$ norm of \sum_n x_n. This inequality is due to Burkholder, Davis and Gundy in the commutative case. By duality, we obtain a version of Doob's maximal inequality for $1

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