Cokernel of injective endomorphisms of a finitely generated free abelian group
4998
Question on determinants of matrices changing between integer matrices
70298
Are quotients of chain groups $C_n(X)/C_n(A)$ still free?
97608
Showing a Ring of endomorphisms is isomorphic to a Ring
30825
Infinite coproduct of abelian groups
88930
Homomorphism between free groups
81762
Colimits in that category of short exact sequences of abelian groups
72211
Isomorphism involving Eilenberg-Maclane space, Tors.
93358
Find an example of a non-surjective field endomorphism
124864
A not free $\mathbb{Z}$-module
12474
Does an injective endomorphism of a finitely-generated free R-module have nonzero determinant?
87534
Finitely generated group which is not finitely presented
158396
Finite $G$ with involutory automorphism $\alpha$ with no nontrivial fixed points. Proving properties of $\alpha$.
95930
Finitely generated modules over a Noetherian ring are Noetherian
17978
Isomorphism classes of $\mathbb{Z}[i]$ modules.
47086
Quotient rings and free modules
158892
Surjective endomorphism of abelian group is isomorphism
122353
Status of the classification of non-finitely generated abelian groups.