3,270 reputation
1629
bio website
location
age
visits member for 2 years, 2 months
seen 15 mins ago

Apr
8
answered Convert from base 10 to base 5
Apr
5
comment Simple way to see this integral is 0?
See math.stackexchange.com/questions/139393/…
Apr
5
answered What is the probability that you will see an odd number of heads?
Apr
1
answered What is the legality of the following series?
Mar
31
comment $f(x)=x$ if $x$ is rational , $f(x)=1-x$ if $x$ is irrational, at what point this function is continuous?
You beat me to it, +1
Feb
26
comment Finding out the coeffcient next to $x^2$ in $(\cdots(x-2)^2-2)^2\cdots-2)^2$.
I don't know why it is, but it seems the recurrence is $a(n)=20a(n-1)-64a(n-2)$, which gives the solution $(4*16^n-4^n)/3.$
Feb
19
comment Prove that $\sum_i\sum_j a_{ij}=\sum_j\sum_i a_{ij}$
See math.stackexchange.com/questions/497096/…
Jan
9
reviewed Approve suggested edit on proving a specific trig inequality
Nov
29
awarded  Civic Duty
Oct
27
reviewed No Action Needed Find $a\in\mathbb{N}$ such that $n^4+a$ is not prime $\forall n\in\mathbb{N}$
Oct
23
revised How to change to same units
edited tags
Oct
23
comment Integral of product of two measurable functions
This is essentially a special case of Holder's inequality.
Oct
23
answered Intuition behind product rule of probability
Oct
22
answered Proof of Aristarchus' Inequality
Oct
22
reviewed Approve suggested edit on Polynomial inequality proof
Oct
22
comment Mean value of the image of an exponentiallly distributed time under a smooth curve
$f(t)$ should be $\phi(t)$ in 3.
Oct
22
reviewed Reviewed prove that quadrangle is isosceles trapezoid
Oct
21
comment How prove this $\int_{-\pi}^{+\pi}\cos{(2x)}\cos{(3x)}\cos{(4x)}\cdots\cos{(2005x)}dx>0$
I dont have a solution, just some computation with maple/ WA
Oct
21
comment How prove this $\int_{-\pi}^{+\pi}\cos{(2x)}\cos{(3x)}\cos{(4x)}\cdots\cos{(2005x)}dx>0$
The integral of $\prod_{k=2}^{n}cos(kx)$ seems to be $0$ for values of $n$ congruent to $-1, 0 \mod 4$ and a positive rational fraction of $\pi$ for $1,2\mod 4$
Oct
21
reviewed Approve suggested edit on $x^{y^z}$: is it $x^{(y^z)}$ or $(x^y)^z$?