Javier
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 Jun 1 accepted Proving that $\lim\limits_{x \to 0}\frac{e^x-1}{x} = 1$ May 20 accepted Confused about Wikipedia page on differential forms May 4 accepted How to prove $\lim_{(x,y)\to(0,0)} \frac{xy}{x+y} = 0$ Apr 30 accepted Can I apply Rolle's theorem in reverse? Apr 27 accepted Proving statement about sequences Apr 14 accepted Proving limit doesn't exist using the $\epsilon$-$\delta$ definition Apr 5 accepted Would like some pointers on this geometry problem Mar 13 accepted Are there exact expressions for $\sin \frac{3\pi}{8}$ and $\cos \frac{3\pi}{8}$? Feb 29 accepted How to solve $y'' = -\frac{k}{y^2}$, with $k > 0$? Feb 16 accepted Confused about characteristic equation of a linear ODE Feb 6 accepted Am I doing this double integral right? Feb 4 accepted How to justify this differential manipulation while integrating? Jan 5 accepted Taking the derivative of $\frac1{x} - \frac1{e^x-1}$ using the definition Nov 25 accepted Find $f(x)$ such that $f(x) = 1 + \frac1{x} \int_1^x f(t) \mathrm{d}t$. What am I doing wrong? Oct 28 accepted Maclaurin series of $\frac{1}{1+x^2}$ Oct 28 accepted Why does this method for solving matrix equations work? Oct 19 accepted If all the vectors of a basis of a vector space are contained in another space, is the first space a subspace of the second? Sep 20 accepted Which side should the “hat” of unit vectors point to? Aug 8 accepted How to tell if a set of vectors spans a space? Jul 16 accepted Solving $\lim\limits_{x \to 0^+} \frac{\ln[\cos(x)]}{x}$