Suppose that CD = DC, and find the flaw in the following argument: Taking determinants
Chapter 4, Problem 4.2.19(choose chapter or problem)
Suppose that CD = DC, and find the flaw in the following argument: Taking determinants gives (detC)(detD) = (detD)(detC), so either detC = 0 or detD = 0. Thus CD = DC is only possible if C or D is singular.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer