Hi community,

In the video https://www.coursera.org/learn/machine-learning-linear-algebra/lecture/3UmWw/row-operations-that-preserve-singularity, Luis mentioned that the proof for adding row to another row preserve singularity/non-singularity is included in a written tandem in the resources of the class. But I cannot find it anywhere.

Can anyone kindly point me to that?

Thank you.