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Martin Sleziak
Martin Sleziak
10:04 AM
specific-question What are suitable tags for Baer sum and endomorphisms?
The corresponding post on Mathematics: Baer sum and endomorphisms. (It is recommended to link the posts to each other when posting on multiple sites.) — Martin Sleziak 2 mins ago
I will also point out that the tag (abstract-algebra) is deprecated on MO, see the tag-info. It is also recommended to use at least on top-level tag. Perhaps some users who look at this question can suggest suitable tags. — Martin Sleziak 51 secs ago
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Q: Baer sum and endomorphisms

57JimmyI work in an Abelian category. If I take the Baer sum $M' + M''$ of two extensions $M'$ and $M''$ of $ M_2$ by $M_1$, i.e., $$ 0 \to M_1 \to M' \to M_2 \to 0$$ is exact, and the same for $M''$, then what do I know about $\mathrm{End}(M' + M'')$? Do I have any access to it? I know everything I wan...

homological-algebra abstract-algebra
I would probably add abelian-categories, but I am not really sure which top-level tags should be usedhere.
 
Badr Bellaj
Badr Bellaj
10:56 AM
Hi all,
I have a problem with my mod dashbord I can't access the MOD announcement messages
any suggestions?
 
Martin Sleziak
Martin Sleziak
11:55 AM
1
Q: Baer sum and endomorphisms

57JimmyI work in an Abelian category. If I take the Baer sum $M' + M''$ of two extensions $M'$ and $M''$ of $ M_2$ by $M_1$, i.e., $$ 0 \to M_1 \to M' \to M_2 \to 0$$ is exact, and the same for $M''$, then what do I know about $\mathrm{End}(M' + M'')$? Do I have any access to it? I know everything I wan...

ct.category-theory homological-algebra abelian-categories
@BadrBellaj I guess you're unlikely to get some response here. You could try some of the rooms where you are more likely to find some moderators, possibly Teacher's Lounge or maybe also Tavern on Meta.
 

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