List questions from homological-algebra

Published on 28 Nov 2016 - 15:16

342

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Do deformations of a vector bundle form a vector space?

Published on 25 Mar 2026 - 11:12

805

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An isomorphism between Tor over different rings.

Published on 25 Mar 2026 - 19:01

116

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One question about homological algebra

Published on 29 Nov 2016 - 14:36

110

Views

Very basic derived functor question

Published on 25 Mar 2026 - 20:40

1k

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Isn't every finite cyclic group a free group?

Published on 27 Mar 2026 - 9:56

61

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Why isn't $H_i(\mathbb{Z}^d,\mathbb{Z})=0$ for all $i\geq 2$?

Published on 27 Mar 2026 - 9:48

112

Views

$A\cong \Bbb Z_{(p)}\otimes A$ if multiplication by $n$ is iso

Published on 05 Dec 2016 - 16:22

604

Views

Is this an equivalent definition for chain homotopy?

Published on 06 Dec 2016 - 15:04

279

Views

Why are morphisms in the derived category spans, not cospans?

Published on 28 Mar 2026 - 10:40

3.8k

Views

Why group cohomology and not group homology?

Published on 27 Mar 2026 - 9:48

698

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Is a chain map inducing zero on all homology groups necessarily a boundary?

Published on 09 Dec 2016 - 10:37

81

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Zero element of extensions of $M$ by $N$

Published on 26 Mar 2026 - 6:29

586

Views

Invert a quasi isomorphism of chain complexes

Published on 10 Dec 2016 - 19:41

72

Views

Finite coproduct of finitely presentated objects is finitely presentated.

Published on 12 Dec 2016 - 18:54

List Question

Homology of $S^{n} \bigcup\limits_{f}e^{2n}$ space

Do deformations of a vector bundle form a vector space?

An isomorphism between Tor over different rings.

One question about homological algebra

Very basic derived functor question

Isn't every finite cyclic group a free group?

Why isn't $H_i(\mathbb{Z}^d,\mathbb{Z})=0$ for all $i\geq 2$?

$A\cong \Bbb Z_{(p)}\otimes A$ if multiplication by $n$ is iso

Is this an equivalent definition for chain homotopy?

Why are morphisms in the derived category spans, not cospans?

Why group cohomology and not group homology?

Is a chain map inducing zero on all homology groups necessarily a boundary?

Zero element of extensions of $M$ by $N$

Invert a quasi isomorphism of chain complexes

Finite coproduct of finitely presentated objects is finitely presentated.

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