List questions from homology-cohomology

Published on 11 May 2026 - 0:13

326

Views

Computing the homology of $\mathbb{S}^1$ attached with two $2$-cells via degree $2$ and $3$

Published on 10 May 2026 - 18:29

91

Views

Homology union three subspaces.

Published on 10 May 2026 - 23:14

359

Views

How are rational algebraic Hodge classes of type $ (p,p) $ defined?

Published on 21 Apr 2026 - 10:26

80

Views

Is it true that $(\mathbb{Z}\bigoplus\mathbb{Z}\bigoplus\mathbb{Z})/(\mathbb{Z}\bigoplus\mathbb{Z})\cong\mathbb{Z}$

Published on 11 May 2026 - 23:30

1.5k

Views

Chern classes, cohomology classes with real/integer coefficients

Published on 18 Apr 2026 - 17:27

197

Views

Cohomology groups $H^p(K;Z)$ where $K$ is finite simplicial complex are finitely generated abelian groups

Published on 10 May 2026 - 22:04

345

Views

Is there any intuition for finding cohomology groups of famous manifolds?

Published on 10 May 2026 - 19:41

365

Views

Orientation class in relative homology and integration

Published on 10 May 2026 - 23:24

67

Views

Given $f:X\to Y$, what relation between induced maps $H_k(X) \to H_k(Y)$ and $H^k(Y) \to H^k(X)$?

Published on 10 May 2026 - 22:02

297

Views

What is the pushout of $D^n \longleftarrow S^{n-1} \longrightarrow D^n$?

Published on 11 May 2026 - 4:07

115

Views

Group theoretic interpretation of the cohomology of $K(G, n)$

Published on 03 May 2026 - 8:59

176

Views

why is this figure not a simplicial complex?

Published on 11 May 2026 - 5:00

174

Views

Induced maps in local homology and isotopies

Published on 10 May 2026 - 17:15

280

Views

Crossed homomorphism/derivation on free group

Published on 29 Apr 2026 - 12:44

List Question

Injective objects in a category

Computing the homology of $\mathbb{S}^1$ attached with two $2$-cells via degree $2$ and $3$

Homology union three subspaces.

How are rational algebraic Hodge classes of type $ (p,p) $ defined?

Is it true that $(\mathbb{Z}\bigoplus\mathbb{Z}\bigoplus\mathbb{Z})/(\mathbb{Z}\bigoplus\mathbb{Z})\cong\mathbb{Z}$

Chern classes, cohomology classes with real/integer coefficients

Cohomology groups $H^p(K;Z)$ where $K$ is finite simplicial complex are finitely generated abelian groups

Is there any intuition for finding cohomology groups of famous manifolds?

Orientation class in relative homology and integration

Given $f:X\to Y$, what relation between induced maps $H_k(X) \to H_k(Y)$ and $H^k(Y) \to H^k(X)$?

What is the pushout of $D^n \longleftarrow S^{n-1} \longrightarrow D^n$?

Group theoretic interpretation of the cohomology of $K(G, n)$

why is this figure not a simplicial complex?

Induced maps in local homology and isotopies

Crossed homomorphism/derivation on free group

Trending Questions

Popular # Hahtags

Popular Questions