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mathcounterexamples.net
  • Member for 10 years, 1 month
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About

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!

My LinkedIn page. A long time ago I programmed some modules of CATIA a famous computed aided design solution.

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question
66
Results true in a dimension and false for higher dimensions
Sep 14, 2014
question
35
Why does this sequence converges to $\pi$?
Jan 14, 2015
question
14
ODE properties true in finite dimension but not in Banach spaces of infinite dimension
Jan 11, 2015
question
10
Probability over a plane
Jun 29, 2014
question
10
Examples of continuous differential equations with no solution
Aug 31, 2014
question
8
Non continuous Linear form on $E=C([0,1],\mathbb{R})$ without AC
Oct 14, 2013
answer
6
Counterexamples in algebra?
Oct 26, 2014
answer
6
Counterexamples in algebra?
Dec 14, 2014
question
5
TVS with null topological dual space
May 16, 2015
question
4
Methods for proving non FO definability
Oct 23, 2012
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Latex software used by MO
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Reputation not moving up while having 27 upvotes
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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
What are your favorite instructional counterexamples on sequences?
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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