Talk:Calculus/Extrema and Points of Inflection

Points of Inflection
Points of inflection are defined in Wikipedia as points where the 2nd derivative changes sign, but this is not stated explicitly here. There probably ought to be a section or at least a paragraph that covers points of inflection a little more thoroughly. --Greenbreen (discuss • contribs) 17:52, 11 June 2011 (UTC)