bio  website  wwwirma.ustrasbg.fr/… 

location  Strasbourg  
age  37  
visits  member for  2 years, 3 months 
seen  4 hours ago  
stats  profile views  1,130 
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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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 «referencerequest» 
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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 
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graphical estimate of convergence rates [looking for textbook reference]
Your question got downvoted 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 
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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 
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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 
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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 
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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 :) 