Timeline for Definition of subcoalgebra over a commutative ring
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 15, 2020 at 23:23 | vote | accept | CommunityBot | ||
| S Nov 11, 2020 at 22:06 | history | bounty ended | CommunityBot | ||
| S Nov 11, 2020 at 22:06 | history | notice removed | user167952 | ||
| Nov 11, 2020 at 22:06 | vote | accept | CommunityBot | ||
| Nov 11, 2020 at 22:06 | |||||
| Nov 10, 2020 at 22:47 | history | edited | Konstantinos Kanakoglou |
edited tags
|
|
| Nov 9, 2020 at 3:38 | comment | added | Konstantinos Kanakoglou | @Mark Wildon, an example could be the one posted in my answer: take the $\mathbb{Z}$-module $C=\mathbb{Z}/8\mathbb{Z}\oplus \mathbb{Z}/2\mathbb{Z}$ and its submodule $D$,generated by $(2,0)$ and $(0,1)$. Then, the "inclusion" $D \otimes _\mathbb{Z} D \rightarrow C \otimes_\mathbb{Z} C$ is not injective. | |
| Nov 7, 2020 at 21:50 | answer | added | Konstantinos Kanakoglou | timeline score: 4 | |
| Nov 6, 2020 at 10:51 | answer | added | Adrien | timeline score: 4 | |
| Nov 5, 2020 at 20:57 | comment | added | მამუკა ჯიბლაძე | It should be quotient algebra in the opposite category, should not it? | |
| S Nov 5, 2020 at 20:52 | history | bounty started | CommunityBot | ||
| S Nov 5, 2020 at 20:52 | history | notice added | user167952 | Draw attention | |
| Nov 4, 2020 at 18:57 | comment | added | user167952 | @MarkWildon The question that has to be answered first is what a subcoalgebra should be... | |
| Nov 4, 2020 at 12:45 | comment | added | Mark Wildon | What is an important example of a (should be) subcoalgebra $D$ where $j : D \hookrightarrow C$ is injective but $j \otimes j : D \otimes D \rightarrow C \otimes C$ is not? | |
| Nov 4, 2020 at 12:18 | history | edited | user167952 |
edited tags
|
|
| Nov 3, 2020 at 10:39 | comment | added | user167952 | @AlexanderBetts Fair point. Seems like I should get my coffee :) | |
| Nov 3, 2020 at 10:39 | history | edited | user167952 | CC BY-SA 4.0 |
deleted 133 characters in body
|
| Nov 3, 2020 at 10:26 | comment | added | Alexander Betts | I'm a little confused about the third version: isn't the restriction $\Delta|_D$ equal to $\Delta\circ j$ by definition? | |
| Nov 3, 2020 at 9:55 | history | edited | YCor |
edited tags
|
|
| Nov 3, 2020 at 9:29 | history | edited | user167952 | CC BY-SA 4.0 |
added 12 characters in body
|
| Nov 3, 2020 at 9:14 | history | asked | user167952 | CC BY-SA 4.0 |