摘要
Let (Ω,(?), P) be a probability space, ((?)_n) an increasing sequence of σ-algebras contained in (?). Let T be the set of all bounded stopping time. A realvalued integrable adapted sequence (x_n,(?)_n) is called a class of (B^+) [(B^-), (B)],if there is it is called GWT (GBT,GFT), if for any ε>0,
