Definition talk:Vertical Tangent Line

How does PW feel about $\pm \infty$? I try to avoid it because it doesn't make that much sense to me, but maybe I'm being too nitpicky. --GFauxPas 11:38, 22 November 2011 (CST)


 * Don't use it. --prime mover 13:22, 22 November 2011 (CST)