concavity of functions

• concave down/up function - see Functions - Theory - Real functions - Concavity
• convex function - see concave up, Functions - Theory - Real functions - Concavity
• and derivative - see Derivatives - Theory - Derivative - Derivative and concavity
• determining - see Derivatives - Theory - Graphing functions - Concavity and Derivatives - Methods Survey - Graphing functions - Concavity and inflection points