mathcounterexamples.net
I'm living in Paris, France and doing Math as a hobby, with special interest in Mathematical logic and Analysis.
I opened in July 2014 a website dedicated to Math Counterexamples. I welcome any suggestion for additional counterexamples... at least at a level that I can understand!
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Paris, France

Member for 7 years, 1 month

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Last seen Jul 8 '15 at 10:12
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 62 Results true in a dimension and false for higher dimensions
 36 Why does this sequence converges to $\pi$?
 29 Group $G$ whose center $Z(G)$ is cyclic and with $G/Z(G)$ commutative
 21 Proof: Is there a line in the xy plane that goes through only rational coordinates?
 19 Proof that the number of proofs is countably infinite
 18 Is $F=\left\lbrace f: f\in C_{\left[0, 1\right]}, f\left(0\right)=f\left(1\right)\right\rbrace$ complete metric space?
 17 $ \bigcup_{n=1}^{\infty}\{z\in\Bbb C:z^n=1\}=\{z\in\Bbb C:z=1\}$?
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