Talk:Square root of a 2 by 2 matrix

Exhaustive analysis?
The article should enumerate all square roots of a 2×2 matrix M. It is not clear whether it is doing that. In the case of equal eigenvalues, zero determinant, etc. -- is the general formula still exhaustive, or are there other roots as well? --Jorge Stolfi (talk) 01:30, 4 March 2019 (UTC)