Let A,B are square matrices n x n; and I_n is identity matrix.
If AB =I_n, can we obtain BA =I_n?
Thanks for your help.
well, that is not quite right because what we have is that $\displaystyle A$ has a right inverse. we don't know yet if the left inverse of $\displaystyle A$ exists or not.
see my second post in this thread: http://www.mathhelpforum.com/math-he...-fun-16-a.htmlOriginally Posted by mahefo