i have an assignment for tomorrow and i still have 2 exercises that i didn't know how to resolve them.
I will be more than grateful if someone could help me.
Let A be an nxn invertible matrix. Show that if A is in upper (lower) triangular form,then A-1 is also in upper(lower) triangular form
Suppose B is row equivalent to the nxn invertible matrix A.Show that B is invertible.
Thanks in advanced!