Timeline for How close can one get to the missing finite projective planes?
Current License: CC BY-SA 3.0
10 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 27, 2016 at 9:08 | comment | added | Thomas Dybdahl Ahle | This question made me wonder if we can define such a thing as 'an approximation to a finite geometry'? Ideally something that could often be used as a good alternative for orders where perfect geometries don't exist? | |
| S Jan 24, 2016 at 16:35 | history | suggested | Anurag |
added another relevant tag
|
|
| Jan 24, 2016 at 16:00 | review | Suggested edits | |||
| S Jan 24, 2016 at 16:35 | |||||
| Mar 30, 2015 at 10:41 | comment | added | Gordon Royle | A plane of order $7$ has $7^2+7+1=57$ points and lines, so deleting $13$ points/lines would leave a $44 \times 44$ matrix? Or am I missing something? | |
| Mar 30, 2015 at 9:54 | comment | added | Moritz Firsching | compare oeis.org/A072567 | |
| Mar 29, 2015 at 20:48 | answer | added | user48028 | timeline score: 17 | |
| Mar 29, 2015 at 10:40 | answer | added | Stefan Kohl♦ | timeline score: 2 | |
| Jan 26, 2015 at 0:14 | comment | added | Adam P. Goucher | It's infuriating that (as far as I can tell) there isn't an order-3 projective plane embedded as a subset of the order-7 projective plane, as excising it would give a tight lower bound of $300$. | |
| Dec 28, 2014 at 0:42 | comment | added | Brendan McKay | There is a lot of work on the Zarankiewicz problem but I don't recall any that specifically targets the sizes $t^2+t+1$ for $t$ not a prime power. Exact values are only known up to $n=31$ (myself and Narjess Afzaly, as yet unpublished). | |
| Dec 27, 2014 at 12:47 | history | asked | Gjergji Zaimi | CC BY-SA 3.0 |