3,347 reputation
21034
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location Buenos Aires, Argentina
age 21
visits member for 4 years, 2 months
seen 8 hours ago

(my about me is currently blank)


Mar
6
reviewed Approve Solve the differential equation: $(y^2-xy)dx+x^2dy=0$
Feb
28
revised Integrating $f(y) = e^{-y} y^3$
wrong variable name
Feb
28
reviewed Approve If $x=1\mod3$ and $x=0\mod2$, what is it $\mod6$?
Feb
26
reviewed Reject Multiplying matrices of matrices
Feb
24
reviewed Approve Indefinite Integral $\int \sin (x) \ln (\tan (x))dx$
Feb
24
answered Solving $\int\sqrt{1+(-2ax+b)^2}\;dx$
Feb
20
answered $\lim_{(x,y) \to(0,0)}\sin(x - y)$
Feb
12
awarded  Notable Question
Feb
9
reviewed Approve Is there a method to memorizing $\pi$?
Feb
9
answered How to solve $L = (1.463 \cdot 10^7R^2)/(F^2V) - 1.463R$ for $R$?
Feb
6
comment For which constants does the following converge to a delta function?
Depending on your definition of a delta function this may not be possible, since the integral of your function over $\mathbb{R}^2$ doesn't converge for any $n$, no matter what $c_n$ is. As far as I know, the delta function must verify $\int_\mathbb{R} \delta(x)\ dx = 1$.
Feb
5
answered Evaluating $\int \frac{1}{\sqrt{x^2 + a^2}}\, dx$ without resorting to trigonometric $u$-substitution
Feb
5
comment Evaluating $\int \frac{1}{\sqrt{x^2 + a^2}}\, dx$ without resorting to trigonometric $u$-substitution
Would you accept hyperbolic functions? :)
Jan
27
revised Find limit when $\theta$ tends to $0$ of $\tan(\theta) /\theta$
added 10 characters in body
Jan
7
answered Indefinite integral question.
Jan
6
reviewed Approve How to form a differential equation, given temperature and direction of heat flow
Jan
5
reviewed Reject Prove that $4$ is the only solution to $2+2$.
Jan
4
revised Graphs of functions with fractional powers: $x^{p/q}$
edited tags
Jan
1
comment Is this a solution to the indefinite integral of $e^{-x^2}$?
This is a nice idea, but I'm sorry to tell you that there's proof that there is no elementary formula for the integral. If you're okay with a series, just expand $ e^{-x^2} $ and integrate term by term.
Dec
30
accepted Doubts with differential geometry notation in Frankel