===יוני 2010, אוניברסיטת קנט (ארה"ב), שאלה 4 (Donald L. White)===
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
פתרון:נעם ליפשיץ [[http://math-wiki.com/images/c/c1/Hanuka.pdf]]