Javier
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 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. Apr 27 asked Proving statement about sequences Apr 25 comment Calculating derivative of $\operatorname{Log}(z)$ Differentiate both sides of the first equation, maybe? Apr 19 comment How to find the Maclurin Series with using the procedure method for $f(x)=\sqrt{1+2x}$ Shouldn't the limit of the sum be $n$, not $\infty$? Apr 14 accepted Proving limit doesn't exist using the $\epsilon$-$\delta$ definition Apr 14 comment Proving limit doesn't exist using the $\epsilon$-$\delta$ definition Please see my edit, it seems my question wasn't too clear.