Also from the graph, it is evident that f has  absolute maximum value f (a) and
absolute minimum value f (d) Further note that the absolute maximum (minimum)
value of f is different from local maximum (minimum) value of f We will now state two results (without proof) regarding absolute maximum and
absolute minimum values of a function on a closed interval I Theorem 5 Let f  be a continuous function on an interval I = [a, b]