What is the matrix element in d_(1,3) D=\left[\begin{array}{ccc}-7&24&2\\1&15&11\\-9&12&0\\8&-3&-1\end{array}\right]

Question

What is the matrix element in
`d_(1,3)` D=\left[\begin{array}{ccc}-7&24&2\\1&15&11\\-9&12&0\\8&-3&-1\end{array}\right]

Answer 1

`d_(1,3)` is the entry of the matrix
`D` in row 1, column 3. So
`d_(1,3)=2`.