Timeline for (Elementary?) combinatorial identity expressing binomial coefficients as an alternating sum over permutations.
Current License: CC BY-SA 2.5
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 30, 2010 at 22:59 | vote | accept | MTS | ||
| Jun 30, 2010 at 22:55 | history | edited | Qiaochu Yuan | CC BY-SA 2.5 |
added 184 characters in body; added 89 characters in body
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| Jun 30, 2010 at 22:49 | history | answered | Qiaochu Yuan | CC BY-SA 2.5 |