Aryabhata
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 Jan12 comment Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$ @HansLundmark: Right! Why is it constant Jack? -1 till this is resolved. Jan12 revised Sum: $\sum_{n=1}^\infty\prod_{k=1}^n\frac{k}{k+a}=\frac{1}{a-1}$ removed period used to end english. Jan12 comment Locus of line segments That is ok :-) just saying for future reference. (Also suggest reading the blurb of the tag...) Jan12 comment Locus of line segments graph-theory is a tag about a different subject. Jan12 revised Locus of line segments edited tags Jan12 revised Proving that $1+2^m+3^m+…n^m$ is divisible by $(n+1)$ edited tags Jan12 revised How to prove that every number, such that it's square root is integer, has odd number of divisors? edited tags Jan12 revised BMO preparatory question edited tags Jan12 revised Find all primes different from three for which $(3|p)=1$ edited tags Jan12 revised Divisibility Question. edited tags Jan12 comment Why doesn't every integral from 0 to $2\pi$ equal zero? $\int_{a}^{b} f(x) dx = 0$, make the substitution $t = (x-a)(x-b)$... Jan12 comment Geometry question: translating a rectangle according to a specific rule Why don't you describe what you are doing, in the question statement? Jan12 comment For finding limits of functions, when are graphs deceiving? Not sure if it qualifies though... Jan12 answered For finding limits of functions, when are graphs deceiving? Jan12 comment Convergence of the sequence $x_n=\tan x_{n-1}$ This is likely a dupe... Jan12 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... Jan12 answered How prove there exsit $M$ such $a_{n}\le M$ Jan12 revised Fibonacci identity: $f_{n-1}f_{n+1} - f_{n}^2 = (-1)^n$ added 29 characters in body Jan12 revised Find the highest power of two in the expression. edited tags Jan12 revised Fibonacci identity: $f_{n-1}f_{n+1} - f_{n}^2 = (-1)^n$ added 35 characters in body