Rodrigo Ribeiro
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 Jan 13 revised Distribution random variable $W=\sum_{k=1}^{\infty}X_k/2^k$ Improved title formating Jan 13 awarded Organizer Jan 13 suggested approved edit on Distribution random variable $W=\sum_{k=1}^{\infty}X_k/2^k$ Jan 13 revised Distribution random variable $W=\sum_{k=1}^{\infty}X_k/2^k$ Improved formating Jan 13 suggested approved edit on Distribution random variable $W=\sum_{k=1}^{\infty}X_k/2^k$ Jan 13 comment For which values of $p$ is the Markov chain recurrent? ( sort of a RW with two steps forward and one back) No problem. What kind of solution do you look for? Jan 12 answered For which values of $p$ is the Markov chain recurrent? ( sort of a RW with two steps forward and one back) Dec 22 comment Confusion in the defition of 'first passage time' (Markov Chains) When the time is discrete, works for me to see the markov chain as a infinity vector such that the $n$th coordinate indicates which state the process was at time $n$. In this context, $T_i$ is the first coordinate (time) you see the state $i$ in this vector. Was I clear? Dec 21 answered Convergence of Martingale: Exercise (Durrett 5.5.7) Oct 14 awarded Yearling Jul 26 comment Expected maximum degree Erdős–Rényi graph I believe you can do more than that. Once the degree of each vertex follows a binomial distribution of parameters $N-1$ and $p$, via Chernoff bounds you can assure that every vertex is close to his expected value. Then, the maximum degree will be close of $(N-1)p$ with high probability. Jun 24 revised Is my answer correct? Expected number of coin flips to get 5 consecutive heads added 55 characters in body Jun 24 comment Is my answer correct? Expected number of coin flips to get 5 consecutive heads Thanks! you too. Jun 24 comment Is my answer correct? Expected number of coin flips to get 5 consecutive heads Well, I see this kind of solution, usually, in problems involving Discrete Markov Chains. The Gambler's ruin, the first run of three sixes, the secretary problem are classical problems of the subject. Jun 24 comment Is my answer correct? Expected number of coin flips to get 5 consecutive heads No problem, it isn't my first language too. Well, now I get it. And it is correct. Jun 24 answered Is my answer correct? Expected number of coin flips to get 5 consecutive heads Jun 24 comment Is my answer correct? Expected number of coin flips to get 5 consecutive heads I tried to understand the definition of your $X_i$ but I failed. Could you explain again? I didi't understand what you meant by "probability of the random variable $X_i$." Jun 19 answered What is $\lim_{x\to 0} \sum_{n=2}^\infty \frac{\sqrt{x}\ln n}{1+n^2 x}$? Jun 17 comment Convergence in distribution with finite mean Unfortunately, it is wrong. If you simply take $X=Y$ in distribution you have that all the means are equals, thus you have convergence for the sequence they form. Jun 12 answered Degree distribution of the line graph of an Erdös-Rényi random graph