Timeline for Existence of function $g$ such that $f(x,y)\le g(x)+g(y)$ [closed]
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Jun 14, 2020 at 3:04 | review | Reopen votes | |||
| Jun 15, 2020 at 20:11 | |||||
| Jun 8, 2020 at 8:35 | comment | added | YCor | The second "question" was answered in a more general setting in the comments of this subsequent question where the exercise-style was not followed and that question was well-received. This makes it a duplicate, but rather than closing on this grounds, one could remove the second question and focus on the 1st one. But at the same time the first question is possibly too easy to deserve a separate question (it's claimed as easy in the linked question). | |
| Jun 8, 2020 at 8:30 | history | edited | YCor | CC BY-SA 4.0 |
corrected tag; fixed misuse of mapsto
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| Jun 8, 2020 at 6:16 | comment | added | András Bátkai | Such questions are closed, though I was not involved, because there is no question. It sounds like a (hard) exercise for extra credits. | |
| Jun 8, 2020 at 4:03 | review | Reopen votes | |||
| Jun 8, 2020 at 12:38 | |||||
| Jun 8, 2020 at 3:47 | comment | added | abx | I am probably missing something, but why was the question closed? Is there an obvious answer to the second question? | |
| Jun 7, 2020 at 20:58 | history | closed |
Ben McKay Jochen Glueck Loïc Teyssier user44191 Michael Greinecker |
Not suitable for this site | |
| S Jun 7, 2020 at 20:41 | history | edited | leo monsaingeon |
This problem is of purely settheoretic neature
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| S Jun 7, 2020 at 20:41 | history | suggested | Dieter Kadelka |
This problem is of purely settheoretic neature
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| Jun 7, 2020 at 11:45 | comment | added | Dieter Kadelka | One should note that the problems are of purely settheoretic nature. In the first question $\mathbb{Q}$ can be replaced by $\mathbb{N}_0$ and then $g(x) := \max_{y,z \in \mathbb{N_0} :y+z \leq 2x} |f(x,y)|$ (of course very crude) does the job. For the second question I think $\mathbb{R}$ should be well ordered and then ? | |
| Jun 7, 2020 at 11:41 | review | Suggested edits | |||
| S Jun 7, 2020 at 20:41 | |||||
| Jun 7, 2020 at 8:58 | review | Close votes | |||
| Jun 7, 2020 at 21:02 | |||||
| Jun 7, 2020 at 8:33 | history | asked | Gintoki-Sakata | CC BY-SA 4.0 |