General Distributivity Theorem/Examples
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Example of General Distributivity Theorem
Sum of $j$ from $m$ to $n$ by Sum of $k$ from $r$ to $s$
- $\ds \sum_{j \mathop = m}^n \sum_{k \mathop = r}^s j k = \frac 1 4 \paren {n \paren {n + 1} - \paren {m - 1} m} \paren {s \paren {s + 1} - \paren {r - 1} r}$
for $m \le n, r \le s$.