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Nov
26
revised Evaluating $\iint_D \sqrt{4x^2-y^2}\;\ \mathrm dx \ \mathrm dy$
added 3 characters in body; edited title
Nov
25
comment Solve equation $ 1+2^x=3^y$
good old Levi ben Gershon and induction, wonder how many people ever realise that?
Nov
25
revised Evaluate $\int\frac{\cot{x}}{1+\sin{x}+\cos{x}} \mathrm dx$
added 8 characters in body; edited title
Nov
25
revised Is $\sum_{n=1}^{\infty}\frac{2^nn!}{(n+1)!}$ absolutely convergent?
edited title
Nov
25
revised $f(t)=1+t-\dfrac{8}{3}\displaystyle\int_{0}^{t}(\tau-t)^3f(\tau) \ \mathrm d\tau \quad , f(t)=?$
edited title
Nov
25
revised Why $\lim \limits_ {n\to \infty}\left (\frac{n+3}{n+4}\right)^n \neq 1$?
edited title
Nov
25
revised Removing the square root in $\sum_{n=1}^{\infty}\frac{\sqrt{n+3}}{4n^2+n+4}$
edited title
Nov
25
revised Removing the square root in $\sum_{n=1}^{\infty}\frac{\sqrt{n+3}}{4n^2+n+4}$
edited title
Nov
25
reviewed Approve Removing the square root in $\sum_{n=1}^{\infty}\frac{\sqrt{n+3}}{4n^2+n+4}$
Nov
24
awarded  Yearling
Nov
24
revised Why $\sum_{k=1}^{\infty}\frac{\ln(k)}{k}$ diverges?
edited title
Nov
24
revised Why $\sum_{k=1}^{\infty}\frac{\ln(k)}{k}$ diverges?
$ was missing
Nov
24
revised Prove $10^3n^4+10^{-3}2^n=\mathcal O(2^n)$
no need for paranteheis
Nov
24
revised Prove $10^3n^4+10^{-3}2^n=\mathcal O(2^n)$
added 17 characters in body; edited tags; edited title
Nov
24
revised $ \begin{bmatrix} -2 & 5 & 4 \\-1 & 0 & 0 \\0 & 4 & 3 \end{bmatrix}^{2013}$ =?
edited title
Nov
24
revised DE : $\frac{\mathrm d^2(F)}{\mathrm dx^2} -S^2 \cdot (F) = K \cdot e^{-ax}$
edited title
Nov
24
revised If $\int_{-\infty}^{\infty}f(x)\ \mathrm dx=100$ then $\int_{-\infty}^{\infty}f(100x+9)\ \mathrm dx =?$
deleted 2 characters in body; edited title
Nov
24
comment Why $\mathrm e^{\sqrt{27}\pi } $ is almost an integer?
math.stackexchange.com/questions/4544/…
Nov
24
revised Series: $ \sum_{n = 1}^{\infty} \left( \prod_{i = 1}^n (2i - 1) \middle/ \prod_{i = 1}^n 2i \right)^k $
removed redundant info, of course help is needed with something, why else would be posted?
Nov
24
revised Why $\mathrm e^{\sqrt{27}\pi } $ is almost an integer?
added 7 characters in body; edited title