Aryabhata
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 Jan12 revised Fibonacci identity: $f_{n-1}f_{n+1} - f_{n}^2 = (-1)^n$ added 35 characters in body Jan12 comment How to find the numbers of Bezout identity for two numbers Does this help: math.stackexchange.com/a/2995/1102 ? Jan12 comment Limit of $nx_n$ See also: math.stackexchange.com/a/3220/1102 Jan12 revised Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$ added 883 characters in body Jan12 answered Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$ Jan11 revised Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$ edited tags Jan11 comment Closed form for ${\large\int}_0^\infty\frac{x-\sin x}{\left(e^x-1\right)x^2}\,dx$ Where did you come across this? Jan10 comment How many ways can you put 8 red, 6 green and 7 blue balls in 4 indistinguishable bins? Is this from some programming contest? Jan10 comment How are contest problems designed? This might get closed. Perhaps you should rephrase it as a reference request to some article by a contest-math creator or something... Jan10 comment Integer part of a sum (floor) @CFG: I don't understand. What is wrong with mentioning the source? Someone who has physical access can take a look. Jan10 revised How find this $x_{1},x_{2},\cdots,x_{1994}$ with this following system equation $3+2x_{i+1}=3|x_{i}-1|-|x_{i}|$ edited tags Jan10 revised How find this $x_{1},x_{2},\cdots,x_{1994}$ with this following system equation $3+2x_{i+1}=3|x_{i}-1|-|x_{i}|$ added 1 character in body Jan10 comment Finding a separating family of subsets of $[n]$ of size $n+1$. Yes, clearer now. Jan10 comment Finding a separating family of subsets of $[n]$ of size $n+1$. Nope. Still not clear. Are you selecting $\log_2 n + 1$ subsets? (you have it written as elements). Is your question: I can select $\log_2 + 1$ subsets, and given any two elements of $[n]$ you select, one of my selected subsets will only have one of the elements you have selected? Jan10 comment Finding a separating family of subsets of $[n]$ of size $n+1$. Can you clarify the $\lceil\log_2 n\rceil + 1$ part? Where are you actually using it in the question? Jan10 comment How find this $x_{1},x_{2},\cdots,x_{1994}$ with this following system equation $3+2x_{i+1}=3|x_{i}-1|-|x_{i}|$ Take it easy. You misunderstand. I said why don't you include such info... which means, please do include the info for not just this question, but all other questions you ask. Jan10 comment How find this $x_{1},x_{2},\cdots,x_{1994}$ with this following system equation $3+2x_{i+1}=3|x_{i}-1|-|x_{i}|$ Why don't you include such info with every question? (you seem to be asking a lot of questions posed to you as challenges) Jan10 comment How can i prove that this function is in the given bounds? @Bean: Yeah, even the best have blind spots... don't worry. Jan10 comment How find this $x_{1},x_{2},\cdots,x_{1994}$ with this following system equation $3+2x_{i+1}=3|x_{i}-1|-|x_{i}|$ What have you tried? What is the source? Didn't the source provide you an answer? Are you looking to challenge the folks here? Jan10 revised How can i prove that this function is in the given bounds? edited tags