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Jan
12
answered For finding limits of functions, when are graphs deceiving?
Jan
12
comment Convergence of the sequence $x_n=\tan x_{n-1}$
This is likely a dupe...
Jan
12
comment Geometry question: translating a rectangle according to a specific rule
Are you translating the rectangle around line b to make the right corners coincide? From the figure it seems like you are doing some rotation too...
Jan
12
answered How prove there exsit $M$ such $a_{n}\le M$
Jan
12
revised Fibonacci identity: $f_{n-1}f_{n+1} - f_{n}^2 = (-1)^n$
added 29 characters in body
Jan
12
revised Find the highest power of two in the expression.
edited tags
Jan
12
revised Fibonacci identity: $f_{n-1}f_{n+1} - f_{n}^2 = (-1)^n$
added 35 characters in body
Jan
12
comment How to find the numbers of Bezout identity for two numbers
Does this help: math.stackexchange.com/a/2995/1102 ?
Jan
12
comment Limit of $nx_n$
See also: math.stackexchange.com/a/3220/1102
Jan
12
revised Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$
added 883 characters in body
Jan
12
answered Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$
Jan
11
revised Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$
edited tags
Jan
11
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?
Jan
10
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?
Jan
10
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...
Jan
10
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.
Jan
10
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
Jan
10
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
Jan
10
comment Finding a separating family of subsets of $[n]$ of size $n+1$.
Yes, clearer now.
Jan
10
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?