bio  website  perso.univstetienne.fr/… 

location  SaintEtienne, France  
age  33  
visits  member for  3 years, 6 months 
seen  27 mins ago  
stats  profile views  1,630 
I am currently a Maître de Conférences in SaintÉtienne, in France. I am particularly interested in Number Theory and Arithmetic Geometry.
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comment 
When complex conjugation lies in the center of a Galois group
You're perfectly right, I had overlooked your assumption while answering. I erased the portion of text in question. 
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revised 
When complex conjugation lies in the center of a Galois group
deleted 237 characters in body 
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awarded  Enlightened 
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awarded  Nice Answer 
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answered  When complex conjugation lies in the center of a Galois group 
Apr 5 
answered  “frequency” of fields for which the padic regulator vanishes (mod p) 
Mar 31 
answered  Structure of $\text{Aut}_R(R[X])$ 
Mar 28 
comment 
Where to buy premium white chalk in the U.S., like they have at RIMS?
The very sad news, which I got from a Japanese colleague yesterday, is that Rakuten is closing end of March because of some economical issue. So, hurry up! 
Mar 25 
comment 
Why no abelian varieties over Z?
@ Emerton: but oddly enough, KhareWintenberger need an inductive argument whose basic step relies upon Schoof's work on abelian varieties over number field with few bad places... ;) 
Mar 6 
reviewed  Reject Inverse of a matrix expression 
Mar 6 
reviewed  Approve Averages over integer points of the sphere 
Feb 25 
comment 
Why is Class Field Theory the same as Langlands for GL_1?
@Kimball: I have downloaded the notes, but on page 115 you say that there is an isomorphisms between the idèle class group and the Galois group of $K^\text{ab}$, whereas I think you should modout by the connected component. This should create some discrepancy between "Galois characters" and "Hecke characters", no? 
Feb 24 
comment 
structure of norm one group for quadratic extension of padic fields
By definition, $U_E$ are the units, so all its elements are invertible... 
Feb 9 
reviewed  Edit Rational subspaces 
Feb 9 
revised 
Rational subspaces
error in latex 
Jan 27 
reviewed  Approve Besse p134 Riemann tensor in dimension 4 
Jan 23 
comment 
Is there a Galois correspondence for ring extensions?
Since I do not read russian, this might be the right place where to ask: are you aware of a generalization of the norm in a Galois extension of noncommutative algebras? Of course, if one treats central simple algebras, there is a reduced norm, but I am in a more general setting: $k$ a field, $B/A$ a finite (Galois?) extension of noncommutative $k$algebras; and would like something like $\mathrm{Norm}_{B/A}\colon B^\times\to A^\times$. 
Jan 23 
comment 
Fixed field of the Nebentypus of a newform for $\Gamma_1(N)$
Oh, yes, I was sloppy with $L$ and $F$; thanks anyway. 
Jan 23 
comment 
Fixed field of the Nebentypus of a newform for $\Gamma_1(N)$
David, just one question: when you say that $F$ is evidently $\mathbf{Q}(i)$, do you really mean that or simply that it is very much reasonable to guess from the first five coefficients? Of course, this does not affect your argument, but just to know. 
Jan 22 
reviewed  Approve Proof of a cubic equation problem 