Aryabhata
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416/400 score
 Jun 13 awarded Favorite Question Jun 11 awarded Nice Answer Jun 9 comment How do I solve inequalities of the form $\left|\frac{f(x)}{g(x)}\right| \geq 1$? @StevenGregory: You can. Notice the absolute values... Jun 9 comment If $A,B,C,D$ are complex numbers on the unit circle with $A+B+C+D=0$, then they form a rectangle @YotasTrejos: It is not a square. Basically, given $A$, you just reflect it along x and y axis, and then take the negative to get the four corners of the quadrilateral. Now take $A$ close to the y axis and far far away from the x axis. Do you still get a square? May 7 revised First number $\ge n$ that is divisible by $k$? edited tags May 4 comment $g^q-q$ and $g^q-gq$ are primitive roots modulo $q^2$ Using $g$ and $q$ is confusing! Apr 26 comment Reduction from Hamiltonian cycle to Hamiltonian path @graphtheory92: Seems valid to me. What are your concerns? Apr 17 revised Compute $\int_{0}^{\infty}\frac{x \log(x)}{(1+x^2)^2}dx$ edited tags Apr 17 revised Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$ edited title Apr 17 comment Proving that $\lim_{n\rightarrow\infty}n(a_{n+1}-a_{n})=1 \implies a_n$ diverges to $\infty$ Please use more informative titles. Apr 17 revised Infinite series $\sum_{n=1}^{\infty}nx^{n+1}$ does not comply to any of my (known) tests edited title Apr 17 revised Showing that $\sum\limits_{n=1}^{\infty} (a_1+2a_2+…+na_n)/n(n+1) = \sum\limits_{i=1}^n a_n$ edited title Apr 17 comment How can I find if $\sum_{n=1}^\infty {n! \over 10^n}$ converges or diverges? Please use more informative titles. The previous title you had, was on par with "Help!". Apr 17 revised How can I find if $\sum_{n=1}^\infty {n! \over 10^n}$ converges or diverges? edited title Apr 17 revised Proof that $\lim \frac{a_n}{1+a_n^2} = 0 \implies \lim a_n = 0$ deleted 2 characters in body; edited title Apr 17 revised Sum of digits of $11\dots 11^2$ where $11\dots 11$ is a 1992 digit number with all digits $1$ edited tags Apr 17 comment Simplifying Sum @Guest: Using binomial theorem. It is a standard technique. You don't need to know RHS for it. Apr 16 comment Simplifying Sum Without the algebra precalculus tag, the left side is $$\int_{0}^{1} (1-x)^n x^m \text{d}x$$ which is a Beta integral... Apr 14 awarded Notable Question Apr 1 awarded Popular Question