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 January 28th, 2013, 12:38 PM #1 Newbie   Joined: Jan 2013 Posts: 3 Thanks: 0 Convex, concave or neither is convex/concave? So I had this exam question about if this function was concave, convex or nor concave nor convex... e^(x-y) My first guess I would use the maxima/minima theorem Like when A=f''xx = e^(x-y) B=f''xy= -e^(x-y) C=f''yy= e^(x-y) So AC - B = 0 ( (e^(x-y)) * (e^(x-y)) - (-e^(x-y))^2)= 0 so nor convex nor concave right?

neither concave nor convex

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