Definition talk:Concave Function

These definitions don't seem right. They would make all lines through the origin both concave and convex, while I don't think they should be either. Should the definitions be strictly greater than and strictly less than, rather than greater than or equal to and less than or equal to? --Cynic (talk) 17:16, 14 January 2009 (UTC)

You're right, silly mistake. See correction. Also note the drawing I've added to Convex (another one coming for Concave, but these take time) and another couple each to illustrate the alternative conditions. --Matt Westwood 19:55, 14 January 2009 (UTC)