Timeline for Is the multiplication between even numbers an associative algebra?
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
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| Jul 25, 2019 at 4:23 | comment | added | David Roberts♦ | @Sammy in Rey Casse's book 'Projective geometry', it is an exercise to show that $(2)/10$ is a field, and is there denoted $\mathcal{RFF}$, for "Rey's Favourite Field". | |
| Jul 25, 2019 at 4:12 | history | edited | Martin Sleziak | CC BY-SA 4.0 |
http -> https
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| Apr 13, 2010 at 6:50 | comment | added | Sammy Black | Toy example: 6 is the unit for $(2) \subset Z/_{10}$. | |
| Apr 13, 2010 at 1:36 | comment | added | Tom Church | An example of Jonas' point: take functions on a disconnected space, and consider the ideal of functions vanishing on one component. | |
| Apr 13, 2010 at 0:59 | comment | added | Jonas Meyer | A small technicality: Proper 2-sided ideals sure can be unital as algebras (or rings) in their own right. They are not unital subalgebras (or subrings), i.e., they can't have the same unit, but that isn't a problem for the question at hand. | |
| Apr 12, 2010 at 19:09 | history | edited | Qiaochu Yuan | CC BY-SA 2.5 |
added 300 characters in body
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| Apr 12, 2010 at 18:57 | history | answered | Qiaochu Yuan | CC BY-SA 2.5 |