Timeline for What are your favorite finite non-commutative rings?
Current License: CC BY-SA 2.5
7 events
| when toggle format | what | by | license | comment | |
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| Jun 8, 2010 at 23:15 | comment | added | Oliver | I'm going to agree with Martin. This is a lovely answer, and certainly the most enlightening one, but it doesn't really address the question I thought I was asking. Stephen's answer is more directly applicable, which is what I was looking for. | |
| Jun 8, 2010 at 0:02 | comment | added | Victor Protsak | @Harry: I didn't think there was a man or a woman in the US who hasn't heard of the infamous riser pipe! I've been proved wrong. | |
| Jun 7, 2010 at 23:59 | comment | added | Victor Protsak | Martin, I somewhat disagree: it's true that there should be some basic examples, but many examples are formed by a small number of constructions from the ones already known, and constructions are important to keep in mind. | |
| Jun 7, 2010 at 22:52 | comment | added | Martin Brandenburg | Yes, this is an interesting answer. Therefore the most upvotes. But it does not answer the question. The question is about giving nice examples which can be used in practice, and not a classification of all examples. | |
| Jun 7, 2010 at 19:06 | comment | added | Greg Kuperberg | A riser pipe is any pipe sticking up vertically. I was making a reference to the oil spill. Let's say that a riser pipe is a cylinder. You can cut the cylinder either with a clean curve (a round circle) or a messy curve (a fractal, topologists's sine curve, etc.). The analogy is that the clean surves are a cofinal family, just as clean co-Artinian ideals (monomial ideals) in a polynomial ring are cofinal with all co-Artinian ideals. | |
| Jun 7, 2010 at 18:38 | comment | added | Harry Gindi | I don't care how dumb this makes me look: Could you (or someone else) explain the comparison with riser pipe? Also, what is riser pipe? I looked it up, but it just said it was vertical pipe in a building. | |
| Jun 7, 2010 at 16:15 | history | answered | Greg Kuperberg | CC BY-SA 2.5 |