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 Dec 7 awarded Investor Dec 7 awarded Organizer Dec 7 revised Finding the extremal point of a function latex and punctuations Dec 7 suggested approved edit on Finding the extremal point of a function Dec 4 revised Convergence in distribution sequence max fix notations Dec 4 suggested approved edit on Convergence in distribution sequence max Nov 26 comment probability distribution coupon collector's problem Have a look of Analytic Combinatorics by Flajolet, section II.3.2 -- algo.inria.fr/flajolet/Publications/book.pdf Nov 25 comment How to calculate the probability density function for joint distribution? One way to see this is through characteristic functions. There is a theorem which says that $X =_d Y$ iff $X$ and $Y$ has the same characteristic function. So if you write down the characteristic function of the sum of two independent normal random variable, you will see it is indeed a char. function of a normal distribution. Nov 24 answered Existence of some sequence - convergence in distribution Nov 23 comment Probability of an sequence of independent random 2-dimensional vectors The same answer to your previous question also applies here -- math.stackexchange.com/questions/1543383/… Nov 23 revised Probability of an sequence of independent random 2-dimensional vectors Typos and clarify the question. Nov 23 suggested approved edit on Probability of an sequence of independent random 2-dimensional vectors Nov 23 revised Probability of a independent sequence of random variables some typos Nov 23 suggested approved edit on Probability of a independent sequence of random variables Sep 1 awarded Yearling Aug 19 awarded Notable Question Jul 27 awarded Notable Question Jul 2 awarded Popular Question Jun 10 answered Prove that $S_n/\sqrt{n}-S_{4n}/\sqrt{4n} \overset w \longrightarrow \mathcal{N}(0,\sigma^2)$ Jun 8 awarded Notable Question