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Published online by Cambridge University Press: 25 September 2003
The integrability of a control function of the almost sure convergence $$ \displaystyle\lim_{n \to \infty}\frac{X_1(\omega)+X_2(\omega)+\ldots+X_n(\omega)}{T_n}, $$ where $T_n \,{\uparrow}\, \infty $ as $n \to \infty$ and $X_1,X_2,\cdots,X_n,\cdots $ are independent identically distributed random variables, is studied.