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Oct
15
answered How do I reduce this: $\frac{2}{x\ln(4)}\quad ?$
Oct
15
reviewed No Action Needed If $x$ is irreducible, and $x\nmid y$, why are $x$ and $y$ relatively prime?
Oct
15
revised Prove that $6$ divides $n(n + 1)(n + 2)$
edited tags
Oct
14
reviewed Reject suggested edit on Question on questions in Spivak's Calculus?
Oct
14
reviewed Approve suggested edit on Integration by parts: $\int xe^{-x}dx$
Oct
14
revised Determine convergence $\sum_{n=1}^\infty\left(\frac{2 n + 2}{2 n + 3}\right)^{n^2}$
deleted 1 characters in body; edited title
Oct
14
comment What does $\sum_{k=1}^{\infty} \frac{4^k+5}{5^k + k}$ converge to?
T0 $100$ digits precise, it converges to $4.87153489744979239691073609504037432974495311954885531318820133050108439459357‌​2900627247672463071002$, if that sparks someone's mind. WA could not find an exact match
Oct
13
comment Coupon selecting problem
Well, it is the same distribution, with different parameter
Oct
13
revised Coupon selecting problem
added 1024 characters in body
Oct
13
answered Coupon selecting problem
Oct
12
comment Another math contest problem: $\int_0^{\frac{\ln^22}4}\,\frac{\arccos\frac{\exp\sqrt x}{\sqrt2}}{1-\exp\sqrt{4\,x}}dx$
@VladimirReshetnikov makes more sense now. I was only saying that because $1>\ln^2(2)/4.$
Oct
12
comment Another math contest problem: $\int_0^{\frac{\ln^22}4}\,\frac{\arccos\frac{\exp\sqrt x}{\sqrt2}}{1-\exp\sqrt{4\,x}}dx$
Is that $\ln(2)^ 2/4$ in the upper bound?
Oct
12
comment How can I show that by induction?
See math.stackexchange.com/questions/17041/… and look for Arthuro's linked answer in one of the comment
Oct
12
reviewed Approve suggested edit on real analysis functions and interval
Oct
11
reviewed Looks OK How to prove this assertion in $S_n$ for $n \geq 3$?
Oct
11
reviewed No Action Needed How to find area of triangle from its medians
Oct
11
reviewed Approve suggested edit on Find a plane that passes through a point and is parallel to a given plane
Oct
11
reviewed Approve suggested edit on Why is the area under a curve the integral?
Oct
10
reviewed Reject suggested edit on max number of keys in a 2-3-4 tree
Oct
10
comment Is a rational-valued continuous function $f\colon[0,1]\to\mathbb{R}$ constant?
@copper.hat I meant the intermediate value theorem. I somehow always confuse the name of these