eigenvalue "show that" 1. The problem statement, all variables and given/known data Let A be a matrix whose columns all add up to a fixed constant [tex]\delta[/tex]. Show that [tex]\delta[/tex] is an eigenvalue of A 2. Relevant equations 3. The attempt at a solution My solution manual's hint is: If the columns of A each add up to a fixed constant [tex]\delta[/tex], then the row vectors of [tex]A - \delta I[/tex] all add up to (0,0....0). I don't even understand the hint.