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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §5.3 Summation versus Integration, #30 · Calculus · Integrals

The double sum … is

The double sum $\sum_{i = 1}^{2} (\sum_{j = 1}^{3} w_{i, j})$ is $(w_{1, 1} + w_{1, 2} + w_{1, 3}) +______$ . The double sum $\sum_{j = 1}^{3} (\sum_{i = 1}^{2} w_{i, j})$ is $(w_{1, 1} + w_{2, 1}) + (w_{1, 2} + w_{2, 2}) +______$ . Compare.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §5.3 Summation versus Integration, #30

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