3. Concave vs. Convex Relationships

Origin of CONVEX

Middle French or Latin; Middle French convexe, from Latinconvexus vaulted, concave, convex, from com- + -vexus;perhaps akin to Latin vehere to carry — more at way

First Known Use: 1571

http://www.merriam-webster.com/dictionary/convex

CONVEX Function in MATH

http://en.wikipedia.org/wiki/Convex_function