We study the problem of a.s. convergence of the quadratic variation of Brownian motion. We present some new sufficient and necessary conditions for the convergence. As a byproduct we get a new proof of the convergence in the case of refined partitions, a result that is due to Levy. Our method is based on conversion of the problem to that of a Gaussian sequence via decoupling. (C) 2003 Elsevier Science B.V. All rights reserved.
机构:
Department of Mathematics and Systems Analysis, Aalto University, P.O. Box 11100Department of Mathematics and Systems Analysis, Aalto University, P.O. Box 11100
Azmoodeh E.
Valkeila E.
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Department of Mathematics and Systems Analysis, Aalto University, P.O. Box 11100Department of Mathematics and Systems Analysis, Aalto University, P.O. Box 11100
机构:
Henan Normal Univ, Coll Math & Informat Sci, Xinxiang 453007, Henan Province, Peoples R ChinaHenan Normal Univ, Coll Math & Informat Sci, Xinxiang 453007, Henan Province, Peoples R China
Miao, Yu
Xu, ShouFang
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Xinxiang Univ, Dept Math & Informat Sci, Xinxiang City 453000, Henan Province, Peoples R ChinaHenan Normal Univ, Coll Math & Informat Sci, Xinxiang 453007, Henan Province, Peoples R China