2,613 reputation
11332
bio website perso.univ-st-etienne.fr/…
location Saint-Etienne, France
age 33
visits member for 3 years, 4 months
seen 24 mins ago

I am currently a Maître de Conférences in Saint-Étienne, in France. I am particularly interested in Number Theory and Arithmetic Geometry.


1d
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
Jan
21
reviewed Reject When does the homological dimension of a tensor product equal the sum of dimensions?
Jan
14
answered Examples of great mathematical writing
Jan
14
awarded  Electorate
Jan
13
reviewed Approve On $e^{\pi\sqrt{4\cdot163}}$ and unusual connections
Dec
30
reviewed Approve What are the values of this sequence?
Dec
30
comment Localizations or quotients of categories?
@MarianoSuárez-Alvarez: ok, I see. Although already not bad (and in any case more than I could have done), can you think of an "explicit" example which occurs somewhere (or an application of yours)?
Dec
30
comment Localizations or quotients of categories?
Thanks, Quillen indeed ciotains the answer I was looking for. As an aisde, do you have any idea of occurrencies of "moding out homs by relations" which has nothing to do with localizations, as you say at the very beginning of your answer?
Dec
30
revised Localizations or quotients of categories?
deleted 1189 characters in body
Dec
30
accepted Localizations or quotients of categories?
Dec
20
revised Localizations or quotients of categories?
added 1189 characters in body
Dec
15
reviewed Approve A perfect domain that is not integrally closed?
Dec
10
comment examples of class fields
Can you be a bit more precise? Are you looking for a number field $F$ such that its Hilbert class field $H_F$ can be written as $H_F=F(\sqrt[n]{\alpha})$ for some $n$ and $\alpha$? Or am I misunderstanding?
Dec
10
reviewed Reject Number of different normalized inner products
Dec
9
revised Good lecture notes/books on Jacobian of hyperelliptic curve
added 127 characters in body
Dec
9
reviewed Edit Good lecture notes/books on Jacobian of hyperelliptic curve