1,993 reputation
2721
bio website www-irma.u-strasbg.fr/…
location Strasbourg
age 37
visits member for 2 years, 3 months
seen 4 hours ago
I'm working on complex dynamical systems, more specifically on the local/global aspect of singular holomorphic foliations in the complex plane

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awarded  Nice Answer
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comment What justification can you give for the fact that “most ODEs do not have an explicit solution”?
Yes, I was being purposefully vague while linking to a more precise formulation.
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revised Question on the partial differential equations in complex space
added tag «reference-request»
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suggested suggested edit on Question on the partial differential equations in complex space
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answered What justification can you give for the fact that “most ODEs do not have an explicit solution”?
Sep
20
comment graphical estimate of convergence rates [looking for textbook reference]
Your question got down-voted because it is nowhere near research mathematics. This is not the right site for the question, which does not mean it is unsound.
Sep
16
comment Does iterating a certain function related to the sums of divisors eventually always result in a prime value?
Welcome on MO! Although what you describe seems nice, I fail to see a question here. Could you please be more specific as to what your question might be?
Jul
31
awarded  Revival
Jul
27
comment Codimension of the range of certain linear operators
Ok, I asked because your last sentence was unclear to me regarding the question. Thanks for the clarification. Yet, the example I gave shows that in the formal case the question has a positive answer, and the "matrices" for formal power series are not that different from that for polynomials... In fact they are the same, the difference being on the finite support on the series given as arguments, which is not something easily read in the "matrices" (if I'm not mistaken).
Jul
27
comment Codimension of the range of certain linear operators
So, you mean the answer should be positive (according to your experiment), not negative, right?
Jul
25
revised Codimension of the range of certain linear operators
added 84 characters in body
Jul
18
comment Codimension of the range of certain linear operators
No, you're right. I was too quick. I'll modify the answer.
Jul
18
answered Codimension of the range of certain linear operators
Jul
12
awarded  Electorate
Jul
12
revised Literature that helps explain what the theory of numerosities contributes with
latexified
Jul
12
reviewed Reviewed Literature that helps explain what the theory of numerosities contributes with
Jul
12
suggested suggested edit on Literature that helps explain what the theory of numerosities contributes with
Jul
11
comment Algorithm to compute a common denominator of a finite set of rational numbers
How «efficient» should it be? What is the complexity you have at your disposal right now?
Jul
11
comment Variation of the argument of a rational function along a circle
@AliTaghavi I'm not so sure it is such a great question actually. I was aware that if $C$ is spiralling enough then you can get large variations (that's why the question is asked for circles). But you're surely right that there should exists a bound in terms of the length (or more likely «curvature deviation») of $C$.
Jul
11
comment Matrix $A$ such that for all matrices $B$ the product $AB$ has a row with not a single zero
Your class is empty, as $B:=0$ shows. So you want to prevent such things to happen :)