I'm trying to get a system of equations to be aligned nicely, for once :-)
I have a_{1,1} and a_{1,m} that should be aligned, and since the m is wider than the 1, what messes the whole thing up. I could use an array, but the easiest way would be to set either the second one in a_{1,1} as wide as an m, or maybe the whole a_{1,1} as wide as the a_{1,m}