Definition talk:Left Null Space

Re: "it appears to be always defined, so I don't quite grasp this imposition", maybe I'm being nitpicky, but I'm just trying to avoid the situation where the entries of the matrix aren't numbers. Is that so uncommon as to not be worth saying? --GFauxPas 11:04, 29 March 2012 (EDT)
 * Cf. comment on Definition talk:Homogeneous Linear Equations; this is another problem for the page: its context isn't made precise in any way. --Lord_Farin 11:06, 29 March 2012 (EDT)
 * Well it doesn't help that my Linear Algebra class doesn't get abstract until later in the year, so for now reals is all I know. In other words, I don't know enough to fix it. --GFauxPas 11:08, 29 March 2012 (EDT)