(i,j)th Entry
a subscript ij denotes the row and column
The (i,j)th entry refers to the element in the ith row and jth column of a matrix.
For example, in the matrix below:
2 3 5
4 1 6
7 8 9
The (2,3)th entry is 6, since it is the element in the second row and third column.
This notation is commonly used in linear algebra and other fields that involve matrices. It helps to specify exactly which element of a matrix is being referred to, especially when discussing operations such as matrix multiplication or inversion.
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