Question

If R is a reduced row row echelon form for a square matrix A, then either R has a row of zeroes or R is the identity matrix.

True or False.

Asking because there is a contradiction between two past exams i'm looking at.

Answer 1

If R is a reduced row row echelon form for a matrix A, then either R has a row of zeroes or R is the identity matrix.

And also this one, only difference i have just noticed is that this one does not contain the word square.

Answer 2

Only a square matrix, with echelon form, and containing 1's is the identity matrix. Yes, it has to be a square matrix.

Answer 3

Cool, easy, thankyou

Answer 4

You're welcome :)