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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.5 Linear Algebra, #37 · Linear Algebra · Matrices

The symbol … stands for the entry in row …, column

The symbol $a_{ij}$ stands for the entry in row $i$ , column $j$ . Find $a_{12}$ and $a_{21}$ in Problem 36. The formula $Σ a_{ij} b_{j k}$ gives the entry in which row and column of the matrix product $A B$ ?

This exercise builds on another exercise in its source book, which isn't shown here.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.5 Linear Algebra, #37

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