Skip to main content
Search type Search syntax
Tags [tag]
Exact "words here"
Author user:1234
user:me (yours)
Score score:3 (3+)
score:0 (none)
Answers answers:3 (3+)
answers:0 (none)
isaccepted:yes
hasaccepted:no
inquestion:1234
Views views:250
Code code:"if (foo != bar)"
Sections title:apples
body:"apples oranges"
URL url:"*.example.com"
Saves in:saves
Status closed:yes
duplicate:no
migrated:no
wiki:no
Types is:question
is:answer
Exclude -[tag]
-apples
For more details on advanced search visit our help page
Results tagged with
Search options not deleted user 4231

Enriched categories, topoi, abelian categories, monoidal categories, homological algebra.

15 votes

Are there natural examples of non-symmetric Frobenius algebras?

Though "natural" isn't a mathematical term with a strict meaning here, it's worth considering the work of Larson and Sweedler on finite dimensional Hopf algebras in Amer. J. Math. 91 (1969), 75-94. …
Jim Humphreys's user avatar
5 votes
2 answers
1k views

Origin of notion of "split Grothendieck group"?

In the construction of Soergel's bimodules in representtion theory , it's essential for him to work with split Grothendieck groups. Here he starts with a certain small additive category $\mathcal{A} …
10 votes
Accepted

What does the t in t-category stand for?

Though I don't have inside information, it's clear that the notes in Asterisque 100 (1982) by BBD gave the first formal definition of t-category and t-structure on a triangulated category (section 1.3 …
Jim Humphreys's user avatar
4 votes

Indecomposable projectives correspond to irreducibles - reference

It's useful for questions like this to go back to the basic literature where some of these ideas are developed in context. (Serganova's lecture notes look helpful but if course rely on older sources …
Jim Humphreys's user avatar
21 votes
Accepted

Why the BGG category O?

I'd add to what Ben says the observation that people have found a number of different module categories valuable for different purposes within this same Lie algebra context. (And some Lie theory pe …
Jim Humphreys's user avatar
7 votes
Accepted

What is a Specht module?

The short answer to your question about Specht modules for other types than the symmetric group is "yes". The long answer is that you have to dig into the extensive literature built up around cyclo …
Community's user avatar
  • 1