The maximum value 3 of f at x = 1 is called
absolute maximum value (global maximum or greatest value) of f on the interval
[0, 1] Similarly, the minimum value 2 of f  at x  = 0 is called the absolute minimum
value (global minimum or least value) of f on [0, 1] Consider the graph given in Fig 6 19 of a continuous function defined on a closed
interval [a, d]