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question
8
Exercise 2.4.3. (Dimension shifting) from Weibel's Homological Algebra.
Sep 15, 2021
question
5
Homology of a graph - Weibel's Introduction to Homological Algebra exercise 1.1.6.
Jul 24, 2021
question
5
The category of finite abelian groups has no (nonzero) projective objects.
Aug 28, 2021
question
2
Do quotienting and contraction commute?
Feb 23, 2021
question
2
Existence of disjoint $A, B$ such that $0 < \mu(A), \mu(B) < \infty$.
Apr 26, 2021
question
2
Exercise 2.2.2. from Weibel's Homological Algebra. If $A$ has enough projectives, then so does $\operatorname{Ch}(A)$.
Sep 2, 2021
question
1
Is $(\Bbb Q[x])_x/(\Bbb Q[x])$ an Artinian $(\Bbb Q[x])$-module?
Feb 10, 2021
question
1
Corresponding long exact sequence to boundaries-cycle exact sequence to $0 \to Z \to C \to B(-1) \to 0$ breaks up into short exact sequences.
Aug 9, 2021
question
1
Weibel Lemma 1.6.2. definition of exact category.
Aug 25, 2021
question
1
Weibel Lemma 1.6.2.
Aug 25, 2021