Question

Separability of $A \subseteq C$ implies separability of $B \subseteq C$, where $A \subseteq B \subseteq C$

score 129 · Answer 1 · 2026-04-15 17:34:09

129

Views

Separability of $A \subseteq C$ implies separability of $B \subseteq C$, where $A \subseteq B \subseteq C$

Published on 15 Apr 2026 - 17:34

score 239 · Answer 2 · 2026-04-14 03:22:50

239

Views

Moduli space of algebraic surfaces Vs moduli space of curves

Published on 14 Apr 2026 - 3:22

score 104 · Answer 3 · 2026-04-17 08:45:07

104

Views

Is $K[x_1,\ldots,x_{n+1}]$ separable over $K[x_1,\ldots,x_n]$?

Published on 17 Apr 2026 - 8:45

score 63 · Answer 4 · 2026-04-14 03:04:11

63

Views

Number of parameter of a quadric

Published on 14 Apr 2026 - 3:04

score 605 · Answer 5 · 2026-04-13 20:39:08

605

Views

Need for projective modules

Published on 13 Apr 2026 - 20:39

score 382 · Answer 6 · 2026-04-14 09:28:33

382

Views

Is a specific ring extension $B$ of $K[x,y]$ integrally closed? separable?

Published on 14 Apr 2026 - 9:28

score 46 · Answer 7 · 2026-04-16 10:02:38

46

Views

There exists $h:P\longrightarrow M$ such that $fh=g\Leftrightarrow \textrm{Im}(g)\subseteq \textrm{Im}(f)$?

Published on 16 Apr 2026 - 10:02

score 423 · Answer 8 · 2026-04-13 17:41:34

423

Views

Right projective but not bimodule projective

Published on 13 Apr 2026 - 17:41

score 188 · Answer 9 · 2026-04-12 08:32:55

188

Views

Projectivity of $B$ over $C$, given $A \subset C \subset B$

Published on 12 Apr 2026 - 8:32

score 258 · Answer 10 · 2026-04-14 06:45:33

258

Views

Finitely generated projective modules over a simple algebraic ring extension of a polynomial ring

Published on 14 Apr 2026 - 6:45

score 473 · Answer 11 · 2026-04-09 12:49:54

473

Views

How to show that direct product of $\mathbb Z\times\mathbb Z\times\mathbb Z\times...$ is not projective as a $\mathbb Z$ module?

Published on 09 Apr 2026 - 12:49

score 586 · Answer 12 · 2026-04-13 22:32:41

586

Views

Characterization of projective modules?

Published on 13 Apr 2026 - 22:32

score 1.3k · Answer 13 · 2026-04-11 02:52:21

1.3k

Views

Is there an easy example of a module which is not projective

Published on 11 Apr 2026 - 2:52

score 172 · Answer 14 · 2026-04-13 08:01:57

172

Views

Every projective $R$-module $P$ is free

Published on 13 Apr 2026 - 8:01

score 1k · Answer 15 · 2026-04-15 11:49:13

1k

Views

Two modules are isomorphic in the stable module category iff they are projectively equivalent

Published on 15 Apr 2026 - 11:49

List Question

Separability of $A \subseteq C$ implies separability of $B \subseteq C$, where $A \subseteq B \subseteq C$

Moduli space of algebraic surfaces Vs moduli space of curves

Is $K[x_1,\ldots,x_{n+1}]$ separable over $K[x_1,\ldots,x_n]$?

Number of parameter of a quadric

Need for projective modules

Is a specific ring extension $B$ of $K[x,y]$ integrally closed? separable?

There exists $h:P\longrightarrow M$ such that $fh=g\Leftrightarrow \textrm{Im}(g)\subseteq \textrm{Im}(f)$?

Right projective but not bimodule projective

Projectivity of $B$ over $C$, given $A \subset C \subset B$

Finitely generated projective modules over a simple algebraic ring extension of a polynomial ring

How to show that direct product of $\mathbb Z\times\mathbb Z\times\mathbb Z\times...$ is not projective as a $\mathbb Z$ module?

Characterization of projective modules?

Is there an easy example of a module which is not projective

Every projective $R$-module $P$ is free

Two modules are isomorphic in the stable module category iff they are projectively equivalent

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