Timeline for A variant of Cauchy-type functional equation conjecture
Current License: CC BY-SA 4.0
30 events
| when toggle format | what | by | license | comment | |
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| Apr 22, 2019 at 13:04 | vote | accept | math110 | ||
| S Oct 23, 2018 at 14:00 | history | bounty ended | CommunityBot | ||
| S Oct 23, 2018 at 14:00 | history | notice removed | CommunityBot | ||
| Oct 15, 2018 at 13:46 | answer | added | math110 | timeline score: 13 | |
| S Oct 15, 2018 at 12:07 | history | bounty started | math110 | ||
| S Oct 15, 2018 at 12:07 | history | notice added | math110 | Authoritative reference needed | |
| Oct 15, 2018 at 8:15 | review | Close votes | |||
| Oct 15, 2018 at 12:10 | |||||
| Oct 15, 2018 at 7:56 | history | edited | Andrej Bauer | CC BY-SA 4.0 |
LaTeX formatting & capitalized title.
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| Oct 15, 2018 at 7:56 | comment | added | Andrej Bauer | I'm voting to close this question as off-topic because the OP should provide a reference to the paper which they mention in the question. | |
| Oct 15, 2018 at 7:37 | history | edited | math110 | CC BY-SA 4.0 |
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| Oct 15, 2018 at 7:37 | comment | added | math110 | Now it is said there is a counterexamples | |
| Oct 14, 2018 at 14:58 | history | reopened |
Nik Weaver j.c. Jan-Christoph Schlage-Puchta GH from MO Todd Trimble |
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| Oct 14, 2018 at 13:36 | comment | added | GH from MO | I edited the question greatly (for clarity and language), and I voted to reopen it. At the same time, I ask the OP to make a bigger effort (e.g. next time) to formulate his/her question nicely. In particular, the post refers to some paper, hence a reference would be necessary. This site is for professionals, so participants should act like professionals. | |
| Oct 14, 2018 at 13:34 | history | edited | GH from MO | CC BY-SA 4.0 |
added 45 characters in body; edited tags
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| Oct 14, 2018 at 13:17 | history | edited | Jan-Christoph Schlage-Puchta | CC BY-SA 4.0 |
removed superfluous $|$
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| Oct 13, 2018 at 20:17 | comment | added | j.c. | I voted to reopen per Nik Weaver's comment. @inequality If you can, please edit in a citation to the paper you are referring to. | |
| Oct 13, 2018 at 18:05 | review | Reopen votes | |||
| Oct 14, 2018 at 12:48 | |||||
| Oct 13, 2018 at 15:15 | history | closed |
abx Gerald Edgar GH from MO Nik Weaver Alexandre Eremenko |
Not suitable for this site | |
| Oct 13, 2018 at 13:34 | comment | added | Nik Weaver | I voted to close, but after the edit it seems like a reasonable question (with the $\|$ corrected to $|$). | |
| Oct 13, 2018 at 12:56 | history | edited | math110 | CC BY-SA 4.0 |
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| Oct 13, 2018 at 12:52 | comment | added | GH from MO | @CarloBeenakker: Actually, there are many (non-continuous) functions besides $f(x)=cx$ that satisfy the second equation (hence also the first equation). | |
| Oct 13, 2018 at 12:44 | comment | added | Carlo Beenakker | your first equation has unbalanced $|$ (there are three $|$ on the right-hand-side, which makes no sense); in any case, the second equation implies a linear function $f(x)=cx$ and if the first equation is $|f(x-y)|=|f(x)-f(y)|$ that is satisfied for any complex $c$. | |
| Oct 13, 2018 at 12:42 | history | edited | math110 | CC BY-SA 4.0 |
edited title
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| Oct 13, 2018 at 12:37 | history | edited | math110 | CC BY-SA 4.0 |
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| Oct 13, 2018 at 12:32 | comment | added | math110 | @abx,if $f(x)=x+a$ not such condition,and this problem I think it's a research question. It's not simple. | |
| Oct 13, 2018 at 12:32 | history | edited | math110 | CC BY-SA 4.0 |
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| Oct 13, 2018 at 12:25 | review | Close votes | |||
| Oct 13, 2018 at 15:20 | |||||
| Oct 13, 2018 at 12:20 | history | edited | GH from MO |
edited tags
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| Oct 13, 2018 at 12:09 | comment | added | abx | What about $f(x)=x+a$? In any case your question is not appropriate for this site, please use MathStackExchange. | |
| Oct 13, 2018 at 11:56 | history | asked | math110 | CC BY-SA 4.0 |