jp
|
Registered User
|
|
|
May 1 |
comment |
nilpotent fixed-point-free groups of automorphisms @MarkSapir: I don't understand the last sentence of your first comment. Why do you ask about $G$ abelian? |
|
Apr 29 |
comment |
Intution behind conditional expectation when sigma algebra isn’t generated by a partition I'm not sure, if this is the right place to ask this question as it isn't really research level (see FAQ), please ask at math.stackexchange.com instead. [Did you read en.wikipedia.org/wiki/Conditional_expectation?] |
|
Apr 15 |
comment |
wreath product and matrix presentation @Geoff: Yes, $r-1$ not $r$. |
|
Apr 13 |
comment |
wreath product and matrix presentation @Geoff: Do you mean with your first description just the $2$-Sylow of the symmetric group $S_{2^r}$? It is for finite fields $\mathbb{F}_q$ with $q=3 \bmod 4$ also the $2$-Sylow of $GL_{2^r}(\mathbb{F}_q)$. |
|
Feb 18 |
comment |
Math behind databases management and SQL ? You could take a look at "Applied Mathematics for Database Professionals" by Lex de Haan and Toon Koppelaars. I have to confess that I skipped the "math part" at the beginning as I was interested only in its later chapters, but it is worth checking if you can find it in a library. Do not expect interesting theorems. [Lex de Haan was according to the other author an expert on 3-valued logic, but died before finishing writing the chapter about this topic. If I recall correctly, this unfinished chapter was added as an appendix.] |
|
Jan 16 |
comment |
Is there a characterization of groups in which at least one subgroup is not an endomorphism kernel? Can you say anything about groups that are non-boring for an abelian quotient? (like $Q_8$?) |
|
Jan 16 |
comment |
Is there a characterization of groups in which at least one subgroup is not an endomorphism kernel? Suggestion: How about calling a group $G$ boring if all its quotients are isomorphic to some subgroup of $G$? So you are looking for the characterization of non-boring groups. |
|
Jan 13 |
comment |
Is $SL(2,5)$ irreducible? I doubt that this a research level question (see FAQ - the link is at the top). The proper place to ask it is math.stackexchange.com. Anyway, if $SL(2, 5)$ is reducible, what dimension does a proper invariant subspace have? How does the stabilizer in $SL(2, q)$ of the invariant subgroup look like? |
