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Maximum and Minimum Values of a Function in a Closed Interval

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Estimated time: 1 minutes

Notes

Let us consider a function  f  given by
f(x) = x + 2, x ∈ (0, 1) 
The function is continuous on (0, 1) and neither has a maximum value nor has a minimum value. Further, we may note that the function even has neither a local maximum value nor a local minimum value.

However, if we extend the domain of  f  to the closed interval [0, 1], then f still may not have a local maximum (minimum) values but it certainly does have maximum value 3 = f(1) and minimum value 2 =  f(0). 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  following Fig .  a continuous function defined on a closed interval [a, d]. Observe that the function f has a local minima at x = b and local


minimum value is f(b). The function also has a local maxima at x = c and local maximum value is f (c).

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.

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Maxima Minima Part 3 (Local Maxima and Minima) [00:48:12]
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