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 Jul12 revised The variational formulation of entropy edited body May16 revised If the sum of two independent random variables is in $L^2$, is it true that both of them are in $L^1$? deleted 148 characters in body May13 revised If the sum of two independent random variables is in $L^2$, is it true that both of them are in $L^1$? added 148 characters in body May5 revised Simple probability problem? typos Aug1 revised Sum of positive i.i.d. random variables. added 8 characters in body Jun19 revised Is it possible to have $\mathbb E S_n \to \infty$ but $\inf S_n = -\infty$ a.s.? added 5 characters in body Jun14 revised $X,Y$ i.i.d., $X$ and $(X+Y)/\sqrt{2}$ have the same dist., then show that $X$ has a normal distribution deleted 2 characters in body Jun13 revised Convergence to exponential function. added 39 characters in body May30 revised Difference between $P(Y \ge y)$ and $P(Y > y)$. typo Feb25 revised Martingale and bounded stopping time added 73 characters in body Feb21 revised Proving existence of limit by Martingale. added 660 characters in body Feb14 revised Superharmonic function and super martingale. edited title Feb8 revised Question about sigma-algebra generated by a random variable added 3 characters in body Nov13 revised How expected value is related to density function? added 1 characters in body Jun24 revised Spanning tree of a strongly connected directed graph. added 59 characters in body; edited title May31 revised Under what condition do we have $P\{(X|Y)|Z\} = P\{X | (Y \cap Z)\}$ added 517 characters in body Mar24 revised Permutation by interchange. added 217 characters in body Jan24 revised The distribution of the product of Beta Variables. added 6 characters in body Dec17 revised Problem of hypergeometric testing. typo Nov21 revised Can we say a Markov Chain with only isolated states is time reversible? added 360 characters in body