23

Answers
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6
An operation on binary strings
2
example re torsionless quotients of abelian groups
11
For a monoid with zero $M$, how many additive operations on $M$ can there be making $M$ a ring?
5
Exponent of the cohomology of a product of groups
9
Intersection of all normalizers
6
lenght of a finite group versus number of conjugacy classes of subgroups
5
Baer’s criterion for projective modules
0
Let $M$ be a $R$-Bimodule that happens to be projective, is its associated left $R \otimes R^{op}$-module projective too?
3
Detecting and counting free direct summands
1
Explicit indecomposable monomorphism of finitely generated non-indecomposable Abelian groups.
8
Monotonic bijections of rational numbers
2
Inductive vs projective limit of sequence of split surjections
2
Free and cellular G-action implies free G-complex?
-1
Cocomplete but not complete abelian category
4
Stable equivalence and triangle stable equivalence of selfinjective algebras
5
Standard selfinjective algebras and Auslander-Reiten quiver
29
Are there any nontrivial abelian categories with only finitely many objects?
5
About some kind of “converse” of a theorem from Galois theory
4
Free Module with a Projective Sub- Module, and Tensor Products
12
Lifting isomorphisms between derived categories
6
The number in the join of conjugate class and centralizer
4
Permutation characters and regular orbits
5
“Sums-compact” objects = f.g. objects in categories of modules?