Question

Small deformations of smooth projective varieties

score 211 · Answer 1 · 2026-04-12 06:15:37

211

Views

Small deformations of smooth projective varieties

Published on 12 Apr 2026 - 6:15

score 55 · Answer 2 · 2026-04-16 06:22:20

55

Views

Was "closed sets" needed in this proof?

Published on 16 Apr 2026 - 6:22

score 178 · Answer 3 · 2026-04-16 13:51:50

178

Views

Exact sequences, mostly linear algebra and notation confusion.

Published on 16 Apr 2026 - 13:51

score 973 · Answer 4 · 2026-04-14 00:42:01

973

Views

Question about the problem that $P^n$ admits a field of tangent $1$-planes if and only if $n$ is odd.

Published on 14 Apr 2026 - 0:42

score 911 · Answer 5 · 2026-04-17 10:07:02

911

Views

Automorphism of fundamental group of torus

Published on 17 Apr 2026 - 10:07

score 2.6k · Answer 6 · 2026-04-08 17:07:39

2.6k

Views

Is a path connected covering space of a path connected space always surjective?

Published on 08 Apr 2026 - 17:07

score 1.2k · Answer 7 · 2026-04-09 10:04:05

1.2k

Views

Manifold allowing function with two critical points is sphere

Published on 09 Apr 2026 - 10:04

score 89 · Answer 8 · 2026-04-15 19:23:07

89

Views

$x_1$ and $x_2$ lie in the same path component iff $x_1 - x_2 \in im(\Theta)$

Published on 15 Apr 2026 - 19:23

score 1.9k · Answer 9 · 2026-04-15 08:14:38

1.9k

Views

Show that $P\colon S^3\to SO(3)$ is a covering map.

Published on 15 Apr 2026 - 8:14

score 796 · Answer 10 · 2026-04-13 18:31:57

796

Views

Fundamental group of $\mathbb{R}^2\setminus\{x_1, x_2\}$

Published on 13 Apr 2026 - 18:31

score 1.6k · Answer 11 · 2026-04-17 11:32:57

In a path connected space, when does every path between $p$ and $q$ induce the same isomorphism between Fundamental Groups based at $p$ and $q$?

score 62 · Answer 12 · 2026-04-12 18:33:35

62

Views

$\sum_{i=0}^n (-1)^i \delta_i(\sum_{j=0}^{n+1} (-1)^j \delta_j) = 0$, given that $\delta_i \delta_j = \delta_{j-1}\delta_i$ whenever $i < j$

Published on 12 Apr 2026 - 18:33

score 134 · Answer 13 · 2026-03-26 14:28:51

134

Views

Analogue in algebra for characteristic classes?

Published on 26 Mar 2026 - 14:28

score 2.9k · Answer 14 · 2026-04-14 20:25:21

2.9k

Views

Prove that $S^{n-1} \simeq \Bbb R^n - \{ 0 \}$.

Published on 14 Apr 2026 - 20:25

score 257 · Answer 15 · 2026-04-12 05:05:00

257

Views

Singular homology of cofinite topology space

Published on 12 Apr 2026 - 5:05

List Question

Small deformations of smooth projective varieties

Was "closed sets" needed in this proof?

Exact sequences, mostly linear algebra and notation confusion.

Question about the problem that $P^n$ admits a field of tangent $1$-planes if and only if $n$ is odd.

Automorphism of fundamental group of torus

Is a path connected covering space of a path connected space always surjective?

Manifold allowing function with two critical points is sphere

$x_1$ and $x_2$ lie in the same path component iff $x_1 - x_2 \in im(\Theta)$

Show that $P\colon S^3\to SO(3)$ is a covering map.

Fundamental group of $\mathbb{R}^2\setminus\{x_1, x_2\}$

In a path connected space, when does every path between $p$ and $q$ induce the same isomorphism between Fundamental Groups based at $p$ and $q$?

$\sum_{i=0}^n (-1)^i \delta_i(\sum_{j=0}^{n+1} (-1)^j \delta_j) = 0$, given that $\delta_i \delta_j = \delta_{j-1}\delta_i$ whenever $i < j$

Analogue in algebra for characteristic classes?

Prove that $S^{n-1} \simeq \Bbb R^n - \{ 0 \}$.

Singular homology of cofinite topology space

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