So in my textbook it says that if $f$ and $g$ are convex functions, then $h = f + g$ is also a convex function.
My question is, does this extend to a sum of more than just two convex functions. If $f_1,f_2,\dots,f_n$ are all convex functions, is the function $h = f_1 + f_2 + \dots + f_n$ also a convex function?
My attempt at a non formal proof, was that if you let $f$ and $g$ be defined as the sum of two convex functions, than surely you could extend the sum by simply letting your functions be defined as the sum of two convex functions.