Problem Code: 040609MATH

[Amit Goyal]

Definition 1: A function f : R**n --> R is said to be quasi concave if for any 0 < t < 1 and any x, y in R**n  
f(tx + (1-t)y) ≥ min{f(x), f(y)}

Show that f(x, y) = min{x, y} is a quasiconcave function using the definition written above.