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
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Member for 8 years, 6 months
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Last seen Nov 14 '19 at 10:17
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- 65 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
- 23 Proof: Is there a line in the xy plane that goes through only rational coordinates?
- 20 Proof that the number of proofs is countably infinite
- 18 $ \bigcup_{n=1}^{\infty}\{z\in\Bbb C:z^n=1\}=\{z\in\Bbb C:|z|=1\}$?
- 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?
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