lapo3399 Messages 53 Reaction score 0 Thread starter Oct 11, 2007 #1 If a matrix squared is equal to the original matrix, does that mean that the original matrix had to be either the zero matrix or the identity matrix? Thanks.
If a matrix squared is equal to the original matrix, does that mean that the original matrix had to be either the zero matrix or the identity matrix? Thanks.
mathman Science Advisor Homework Helper Messages 8,130 Reaction score 575 Oct 11, 2007 #2 Not necessarily. Any diagonal matrix with ones and zeros along the diagonal will have this property.