Show that every complex non-singular n×n matrix has a square root. [Hint: Show first
that a Jordan block with non-zero eigenvalue has a square root.]
[[hanukahttp://math-wiki.com/images/c/c1/Hanuka.pdf]]
[[פתרון לינארית 2, אונ' קנט, יוני 2010, שאלה 4|פתרון (נעם ליפשיץ)]]