# Jorge Valle

The identity matrix is a matrix with ones on the leading diagonal, and zeros everywhere else. It's commonly denoted by the letter I if the size is evident from the context.

It can also be denoted by In to refer more specifically to an $n$ by $n$ identity matrix.

It's significant in linear algebra because any matrix multiplied by its identity matrix results in the same as the original.

## Numpy

Implementing in Numpy is trivial and easy to remember.