Originally Posted byHweengee;612209My question however, is how do I show that the function [tex

If is an interval, then is quasi-concave iff

So, in the particular case

0,+\infty) \rightarrow{\mathbb{R}},\quad f(x)=x^2" alt="f0,+\infty) \rightarrow{\mathbb{R}},\quad f(x)=x^2" />

analyze graphically that for all the image of any is greater or equal than .

Fernando Revilla