Timeline for Does the set of positive definite kernels on some set X form a ring?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Apr 20, 2019 at 23:50 | comment | added | YCor | It's an abelian group for every abelian group structure... every nonempty set carries an abelian group structure (and even a ring structure). So "any other operation" is too open-ended, since it's not really interesting if the ring structure is unrelated to the way this set was defined | |
| Apr 20, 2019 at 18:53 | vote | accept | Jack O'Connor | ||
| Apr 20, 2019 at 18:11 | answer | added | YCor | timeline score: 0 | |
| Apr 20, 2019 at 16:57 | comment | added | Jack O'Connor | Thank you, yes I had tried to leave a comment but was unable. | |
| Apr 20, 2019 at 14:41 | comment | added | Yemon Choi | I think that this question, while natural, should really have been a comment on the old question (but I appreciate that as a new user you can't yet leave comments) | |
| Apr 20, 2019 at 14:41 | comment | added | Yemon Choi | It isn't a ring: Hagen's statement was not quite correct. It is closed under pointwise addition, multiplication by positive reals, and pointwise product. | |
| Apr 20, 2019 at 14:35 | review | First posts | |||
| Apr 20, 2019 at 14:50 | |||||
| Apr 20, 2019 at 14:30 | history | asked | Jack O'Connor | CC BY-SA 4.0 |