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Laurent Moret-Bailly
Rennes, France
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Top Questions
26
votes
On the definition of regular (non-noetherian, commutative) rings
ag.algebraic-geometry
ac.commutative-algebra
homological-algebra
regular-rings
valuation-rings
asked Apr 3 '19 at 8:38
mathoverflow.net
17
votes
Are flat morphisms of analytic spaces open?
analytic-geometry
rigid-analytic-geometry
ag.algebraic-geometry
asked Oct 5 '10 at 14:25
mathoverflow.net
15
votes
Universal homeomorphisms and the étale topology
ag.algebraic-geometry
schemes
group-schemes
etale-cohomology
asked Nov 24 '10 at 9:11
mathoverflow.net
12
votes
First order decidability of rings vs Diophantine decidability
lo.logic
model-theory
nt.number-theory
ac.commutative-algebra
asked May 6 '13 at 7:03
mathoverflow.net
11
votes
Valuations and separable extensions
valuation-theory
fields
ac.commutative-algebra
characteristic-p
asked Feb 22 '11 at 12:50
mathoverflow.net
11
votes
Ultraproducts and the empty set
model-theory
set-theory
asked Feb 19 '11 at 16:53
mathoverflow.net
9
votes
Constructible sets in Hausdorff spaces
gn.general-topology
point-set-topology
asked Oct 6 '12 at 15:42
mathoverflow.net
8
votes
When is a valued field second-countable?
valuation-theory
fields
ac.commutative-algebra
topological-groups
asked May 15 '12 at 13:58
mathoverflow.net
8
votes
Is $k(\!(x,y)\!)$ a topological field?
ac.commutative-algebra
topological-groups
power-series
local-rings
topological-rings
asked Dec 21 '15 at 13:53
mathoverflow.net
Top Answers
51
Interesting examples of vacuous / void entities
mathoverflow.net
34
Is every commutative ring a limit of noetherian rings?
mathoverflow.net
33
Is the quotient of a toric variety by a finite group still toric
mathoverflow.net
33
Wanted: example of a non-algebraic singularity
mathoverflow.net
30
An etale version of the van Kampen theorem
mathoverflow.net
28
How to show that the following function isn't a polynomial over Q?
mathoverflow.net
25
To what extent does a torsor determine a group
mathoverflow.net
24
What are some examples of ingenious, unexpected constructions?
mathoverflow.net
23
Relationship between Tangent bundle and Tangent sheaf
mathoverflow.net
22
Is there a scheme parametrizing the closed subgroups of an algebraic group?
mathoverflow.net
21
Structure on $X(k)$ for separated finite type alg. space $X$, for complete valued $k$.
mathoverflow.net
20
Non-separated étale algebraic spaces
mathoverflow.net
20
morphisms representable by algebraic spaces vs morphisms representable by schemes
mathoverflow.net
18
Example of codim 1 regular embedding that is not an effective Cartier divisor?
mathoverflow.net
17
Bertini's theorem in char p for base point free linear system
mathoverflow.net
17
The Dual Abelian Variety
mathoverflow.net
17
When are valuative criteria useful?
mathoverflow.net
16
Is every algebraic space the quotient of a scheme by a finite group?
mathoverflow.net
16
Does local triviality in the fppf topology imply local triviality in the etale topology?
mathoverflow.net
15
Completion and algebraic closure
mathoverflow.net
15
Can a coequalizer of schemes fail to be surjective?
mathoverflow.net
15
Number of affines needed to cover a variety
mathoverflow.net
14
Examples of common false beliefs in mathematics
mathoverflow.net
14
Are rational varieties simply connected?
mathoverflow.net
14
Algebraically closed fields with proper maximal subfields
mathoverflow.net
13
Are stably rational surfaces all rational?
mathoverflow.net
13
Automorphisms of rings fixing all prime ideals
mathoverflow.net
12
Flatness of the integral closure
mathoverflow.net
12
Iteration of a morphism and flatness
mathoverflow.net
12
Flat cover by a locally Noetherian scheme
mathoverflow.net
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