Being more precise when giving an example of the Moore-Penrose pseudo-inverse.

[SyxtonPrime]

Describe the mistake
The way this line is worded seems to suggest that the given Moore-Penrose pseudo-inverse can work for non-invertible square matrices.

Location
Please provide the

1. version: Draft 2018-05-28
2. chapter: 2
3. page: 29
4. line number/equation number: 870/2.46

Proposed solution
Perhaps give the mild assumptions required for 2.46 to hold. (The columns of the matrix must be linearly independent).

[mpd37]

fixed in next revision

[SyxtonPrime]

Looks good, I think you may be missing a word in the added line though. Did you mean:

A needs to "have" linearly independent columns?

[mpd37]

Yes. I changed that, too. Thanks!