Timeline for Reference request : an elementary product-sum formula for binomial coefficients
Current License: CC BY-SA 3.0
2 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 10, 2012 at 19:36 | comment | added | Qiaochu Yuan | This doesn't prove that the $d_i$ are non-negative. | |
| May 10, 2012 at 17:31 | history | answered | Ira Gessel | CC BY-SA 3.0 |