Let A be the matrix: [1 2 0 3] [0 0 0 0] [0 0 1 2] Is A in RREF?

1. Jul 10, 2005

AsymptoticCoder

I've taken two upper division courses in linear algebra, and yet a trivial problem has arisen that I am having trouble answering! haha

Let A be the matrix:

[1 2 0 3]
[0 0 0 0]
[0 0 1 2]

Is A in RREF? I say yes, however, the majority of students whose papers I am grading say no. If they are correct, what is the reason?

TIA,
Ryan

2. Jul 10, 2005

matt grime

the row of zeroes should be on the bottom.