Timeline for A combinatorial identity
Current License: CC BY-SA 3.0
9 events
| when toggle format | what | by | license | comment | |
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| Aug 15, 2017 at 16:42 | answer | added | esg | timeline score: 6 | |
| Aug 15, 2017 at 15:12 | answer | added | Fedor Petrov | timeline score: 4 | |
| Aug 15, 2017 at 9:35 | comment | added | Fedor Petrov | Combinatorial reformulation: consider all the trees $T$ on $\{0,1,\dots,K\}$ for which the vertices $1,2,\dots,p$ are in different components of $T\setminus \{0\}$. For each such a tree take a summand $(-K)^{\deg(0)-p}$. The sum equals $(K-2)!/(p-2)!$ for $p\geqslant 2$ and 0 for $p=0,1$. | |
| Aug 14, 2017 at 9:13 | history | edited | Honglu | CC BY-SA 3.0 |
Add details for one of the question.
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| Aug 14, 2017 at 2:50 | answer | added | Ira Gessel | timeline score: 12 | |
| Aug 13, 2017 at 18:38 | vote | accept | Honglu | ||
| Aug 13, 2017 at 13:53 | answer | added | Fedor Petrov | timeline score: 28 | |
| Aug 13, 2017 at 11:35 | history | edited | Honglu | CC BY-SA 3.0 |
added a few words to clarify.
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| Aug 13, 2017 at 11:29 | history | asked | Honglu | CC BY-SA 3.0 |