Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
I have been asked to show that if $A$ is an $n \times n$ reduced row echelon matrix, then either $A = I_n$ or $A$ has a zero row.
Intuitively I see why this is true, but I'm unsure how to show it mathematically?
Required, but never shown
3 years, 5 months ago