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Carlos Jiménez

From the book 2666 by Roberto Bolaño:

«Un oasis de horror en medio de un desierto de aburrimiento»

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  • Mexico City, CDMX, México
  • Member for 3 years, 11 months
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16 A continuous bijection between two complete metric spaces that is not a homeomorphism. Sep 11 '18
11 Mistake in Kolmogorov's Elements of the theory of functions and functional analysis? Dec 29 '17
11 Prove that $\int\limits_{-\infty}^{\infty} \frac{e^{-x}}{1+e^{-2\pi x}}\,dx=\frac1{2\sin\left(\frac{1}{2}\right)}$ May 28 '18
9 How many ultrafilters there are in an infinite space? Nov 15 '18
8 Show that if $x^2>y^2$ then $x>y$ for all positive real numbers Jan 11 '18
6 Theorems in the form of “if and only if” such that the proof of one direction is extremely EASY to prove and the other one is extremely HARD Jan 11 '19
5 $\lim\limits_{x\to0}\sin1/x$ Feb 11 '18
5 A closed set in metric space such that $A'$ is not empty and $(A')'$ is empty Oct 16 '17
5 Solve for $x$, when $x^2-2x=0$ Nov 2 '17
5 $2\log_2 3 \cdot\log_3 2$ without using a calculator Nov 19 '17
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