2009/06/05 by Yu Zhang, Zhang, Yu
Mathematics · #60K #82B 43 #FOS: Mathematics #Probability (math.PR) #math.PR #msc:43 #msc:60K #msc:82B
paper · pdf · doi:10.48550/arxiv.0906.1203
This paper has been withdrawn
arxiv created 2009/06/14 · arxiv updated 2009/12/01
This paper has been withdrawn by the author due to a crucial sign error in Proposition 3.1.