Timeline for Are there any mathematical objects that exist but have no concrete examples?
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| Sep 12, 2021 at 11:29 | history | made wiki | Post Made Community Wiki by Stefan Kohl♦ | ||
| May 11, 2011 at 12:21 | comment | added | Joel David Hamkins | But note also that each of the numbers $2$, $3$ and $5$ is concrete individually and can be given as explicitly as anything can be in mathematics. So this is not really a case where we prove something exists but there is no concrete example; rather, it is a case where among several concrete examples, we can prove that one of them has a certain property, but we don't know which one. | |
| May 11, 2011 at 4:28 | comment | added | S. Carnahan♦ | It is due to Heath-Brown: qjmath.oxfordjournals.org/content/37/1/27.full.pdf | |
| Apr 22, 2011 at 23:47 | history | answered | Olivier Bégassat | CC BY-SA 3.0 |