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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.3 Summation versus Integration, #29 · Calculus · Integrals

The double sum … is … plus

The double sum $\sum_{i = 1}^{2} [\sum_{j = 1}^{3} (i + j)]$ is $v_{1} = \sum_{i = 1}^{3} (1 + j)$ plus $v_{2} = \sum_{j = 1}^{3} (2 + j)$ . Compute $v_{1}$ and $v_{2}$ and the double sum.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.3 Summation versus Integration, #29

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The **double sum** … is … plus

The double sum … is … plus