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Qing Liu
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122
Answers
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activity
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34
Definition and meaning of the conductor of an elliptic curve
Jan 26 '10 at 22:50
27
When does the relative differential $df=0$ imply that $f$ comes from the base?
Sep 14 '11 at 0:16
26
morphism closed + fibres proper => proper?
Feb 16 '10 at 22:53
25
Do all curves have Néron models
Oct 24 '12 at 22:47
24
Is there a connected non-affine scheme $S$ such that it is the union of rings of integers of number fields?
Sep 25 '11 at 22:15
22
Continuity in terms of lines
Nov 21 '10 at 21:01
22
Completion of modules of differentials (A strange exercise in Liu's AG textbook)
Jan 24 '10 at 1:34
20
Rings in which every non-unit is a zero divisor
Oct 18 '10 at 20:00
18
Noether's normalization lemma over a ring A
Oct 18 '10 at 20:39
15
Can we always find a curve which doesn't have semi-stable reduction
Oct 12 '11 at 22:30
15
A finitely generated $\mathbb{Z}$-algebra that is a field has to be finite
Mar 6 '11 at 0:33
15
Definition of Chow groups over Spec Z
Mar 9 '10 at 21:49
14
When is Br(X) = H^2(X,G_m)?
Mar 1 '10 at 9:52
12
Picard group of reducible varieties
Mar 2 '11 at 18:47
12
When is an irreducible scheme quasi-compact?
Aug 5 '10 at 17:39
11
reduction of elliptic curves
Sep 10 '12 at 8:01
11
Example of inclusion which is not a finite morphism
Mar 9 '10 at 21:54
11
Are there Néron models over higher dimensional base schemes?
Jan 25 '10 at 22:42
11
When two k-varieties with the same underlying topological spaces isomorphic?
Jan 23 '10 at 22:36
10
Restricting finite morphism to finite etale morphim
Mar 24 '11 at 21:09
9
Genus computation
Nov 17 '12 at 22:19
9
countable union of closed subschemes over uncountable field
Aug 27 '11 at 21:35
9
Is the tensor product of regular rings still regular
Dec 22 '10 at 15:03
9
Descent of closed subschemes over finite fields
Nov 10 '10 at 23:35
9
Simply connected quasi-projective varieties in positive characteristic
Feb 22 '10 at 14:43
9
Is the mapping from a scheme to its global sections a closed map?
Jan 30 '10 at 22:01
8
reduction types of elliptic curves
Apr 24 '13 at 13:52
8
Curve through a point on a variety
Nov 11 '12 at 16:44
8
Cohen-Macaulay sheaves which are not locally free
Sep 7 '12 at 6:43
8
Unramified (finite) extensions of fields complete with respect to a discrete valuation
Mar 6 '11 at 22:00
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