Timeline for Reference request : an elementary product-sum formula for binomial coefficients
Current License: CC BY-SA 3.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 10, 2012 at 0:54 | comment | added | Qiaochu Yuan | @Brendan: ah yes, you're right. | |
| May 10, 2012 at 0:54 | history | edited | Qiaochu Yuan | CC BY-SA 3.0 |
deleted 11 characters in body
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| May 10, 2012 at 0:32 | comment | added | Brendan McKay | Which implies $d_i = \binom{i}{a}\binom{a}{b-i+a}$, I think. But the limits are not $\min(a,b)$ to $\max(a,b)$, they are $\max(a,b)$ to $a+b$. | |
| May 10, 2012 at 0:30 | vote | accept | Kyungyong Lee | ||
| May 10, 2012 at 0:23 | history | edited | Brendan McKay | CC BY-SA 3.0 |
fix binomials
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| May 10, 2012 at 0:22 | history | answered | Qiaochu Yuan | CC BY-SA 3.0 |