Timeline for Perfect sphere packings (as opposed to perfect ball packings)
Current License: CC BY-SA 4.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Oct 16, 2020 at 14:22 | vote | accept | Nick Gill | ||
| Oct 2, 2020 at 11:42 | comment | added | Nick Gill | @AaronMeyerowitz, Thank you for this. Certainly a proof of that conjecture would be enough to ensure I only look at spheres of radius 1 or n-1.... I must admit, though, that my feeling was that the question I asked should be much easier than this conjecture! I rather fancied I was being a dummy for not seeing a straightforward proof... But perhaps it is a harder problem than I first thought... | |
| Oct 1, 2020 at 23:59 | comment | added | Aaron Meyerowitz | With regard to prime divisors of binomial coefficients, $\binom{50}{3}=140^2.$ A conjecture of Erdos and Selfridge is that with this one exception, for $3 \le k \le \frac{n}{2}$, there is a prime $p>k$ which divides $\binom{n}{k}$ but $p^2$ does not. | |
| Oct 1, 2020 at 16:30 | history | edited | Nick Gill | CC BY-SA 4.0 |
edited body
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| Oct 1, 2020 at 15:15 | answer | added | LeechLattice | timeline score: 5 | |
| Oct 1, 2020 at 10:12 | history | edited | Nick Gill | CC BY-SA 4.0 |
too many "rathers"
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| Oct 1, 2020 at 9:31 | history | asked | Nick Gill | CC BY-SA 4.0 |