Ralph

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Name Ralph
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Seen May 17 at 13:40
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Is there a Kan-Thurston theorem for fibrations ?

jul 18 at 15:17 Allan Edmonds 1,811●1●7●12

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357
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Bloch-Kato conjecture and Wiles' numerical criterion

jun 18 at 18:55 Ralph 12.5k●10●36

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12
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2
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397
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Categories where projective objects are flat

feb 14 at 19:57 David White 4,858●1●20●27

 
11
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1
answer
670
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Meaning of ‘alternating’ group ?

sep 1 11 at 2:49 Timothy Chow 14.4k●1●68●137

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9
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2
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222
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Classifying space of the unit circle of a valued field

may 17 12 at 11:05 Johannes Ebert 11.4k●33●55

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9
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4
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254
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Applications of Govorov-Lazard Theorem?

may 5 at 8:08 Martin Brandenburg 29.1k●2●45●129

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9
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Minimal number of cells of a CW complex (up to homotopy)

oct 25 at 0:42 Ralph 12.5k●10●36

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171

Answers
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23
Non-split extension of the rationals by the integers
18
Is strong approximation difficult?
14
Does the knowledge of $Z(G)$ and $G/Z(G)$ give the full group?
13
Subgroups of GL(2,q)
13
When does a homomorphism factor through a free group?
13
non-commutative finite rings
12
Can Ext over a group ring always be expressed as group cohomology ?
12
Where else do the (topology) separation axioms turn up?
11
When is an acylic chain complex contractible
11
Is a domain all of whose localizations are noetherian itself noetherian ?
11
The coproduct on the cohomology of a Hopf algebra
11
functions satisfying “one-one iff onto”
11
Orthogonality in non-inner product spaces
11
Which topological spaces are (topological) groups?
10
Epimorphisms and free submodules
10
On two spectral sequences for the cohomology of a double complex
10
Is a bialgebra with all group-like elements invertible a Hopf algebra?
10
Jacobson’s theorem and further
9
Blackbox Theorems
9
Homology of a certain group
9
Cohomology ring of BG
9
p-group with large center
8
Galois cohomology H^1(Q_p, Z_p(2)) = 0?
8
Principal congruence subgroups of $SL(n, \mathbb{Z})$
8
Which information can be obtained from Poincaré series ?
8
What is the “ray” in ray class group?
8
How to Compute Transgressions in a Serre Spectral Sequence?
8
Interesting conjectures “discovered” by computers and proved by humans?
8
Projective Varieties
8
Projective objects in the category of chain complexes (2)
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