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

(my about me is currently blank)


May
26
revised How to show $|\sin(x+iy)|^2=\sin^2x+\sinh^2y$
added 372 characters in body
May
26
answered How to show $|\sin(x+iy)|^2=\sin^2x+\sinh^2y$
May
20
accepted Confused about Wikipedia page on differential forms
May
19
comment Confused about Wikipedia page on differential forms
So, just to make sure I understand: Suppose we're working in $\mathbb{R}^2$, and instead of $x,y$ I call them $f_1, f_2$ for clarity, so they're functions from $\mathbb{R}^2$ to $\mathbb{R}$. Then we can say that $f_1(a, b) = a$ and $f_2(a,b)=b$?
May
17
asked Confused about Wikipedia page on differential forms
May
13
awarded  Fanatic
May
4
accepted How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$
May
4
comment How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$
I guess this is a simpler way to know. How did you think of approaching along $y=x^2-x$?
May
4
comment How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$
@ArturoMagidin: Oh, I thought you could just sort of ignore it. This means that the limit doesn't exist, then?
May
4
comment How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$
@Dylan: Well, the function is not even defined along that line. Does that matter?
May
4
asked How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$
Apr
30
comment Can I apply Rolle's theorem in reverse?
Thank you for your answer. While it helped me with the problem, David's answered the point of the question, so I accepted his. Thank you anyway.
Apr
30
accepted Can I apply Rolle's theorem in reverse?
Apr
30
comment Can I apply Rolle's theorem in reverse?
@ArturoMagidin: I fixed the intervals.
Apr
30
revised Can I apply Rolle's theorem in reverse?
fixed intervals
Apr
30
asked Can I apply Rolle's theorem in reverse?
Apr
30
comment Natural Logarithm and Integral Properties
@GiovanniDeGaetano: It looks like the whole point of the exercise is to prove that $(\ln x)' = \frac1{x}$, and establish its properties.
Apr
27
accepted Proving statement about sequences
Apr
27
comment Limit inside an integral
No, $\int \ \mathrm{d}x = x + C$.
Apr
27
comment Limit inside an integral
@AbdelmajidKhadari: You're missing an $x$ after integrating.