Yes, one almost never inverts a matrix using a computer, and one never inverts a matrix by hand. What does that teach you? I was pretty surprised to see trivi

Yes, one almost never inverts a matrix using a computer, and one never inverts a matrix by hand. What does that teach you? I was pretty surprised to see trivialities like this in a four-page summary. But, unfortunately, this is just a poor summary. It also barely covers the spectral decomposition, and has no mention at all of the singular-value decomposition.