In my class we've been talking about elementary row operations of matrices, for example, to get its inverse. I remember the teacher saying, those operations don't work for columns; however, in my book, it says they do work. Can I use them on columns to get to the identity matrix for instance, so that I can, then, get its inverse.
Answer
The Gauss-Jordan method is based on rows operations by
$$A^{-1}\cdot (A|I)=(I|A^{-1})$$
we can also operate by columns operation that is
$$\begin{pmatrix}A\\I\end{pmatrix}A^{-1}=\begin{pmatrix}I\\A^{-1}\end{pmatrix}$$
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