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If a function has an absolute maximum at x = b, then f (b) is the largest value
that f can attain. Similarly, if a function has an absolute minimum at x = b, then
f (b) is the smallest value that f can attain.

On the graph above of the function f on the closed interval [a, e], the point (a, f (a))
represents the absolute minimum, and the point (d, f (d )) represents the absolute
maximum.

To define these terms more formally: a function f has an absolute maximum at x = b if f (b)≥f (x) for all x in the
domain of f. A function f has an absolute minimum at x = b if f (b)≤f (x) for all
x in the domain of f. Together, the absolute minimum and the absolute maximum
are known as the absolute extrema of the function.

Local Extrema

A function f has a local maximum at x = b if f (b) is the largest value that f
attains "near b." Similarly, a function f has a local minimum at x = b if f (b)
is the smallest value that f attains "near b." In the graph above, f has a local
maximum at x = b and at x = d, and has a local minimum at x = c.

Taken together, the local maxima and local minima are known as the local extrema. A local minimum or local maximum may also be called a relative minumum or relative maximum.

To define these terms more formally: a function f (x) has a local (or relative) maximum at x = b if there is an open interval
I in which f (b)≥f (x) for all x in I. A function f (x) has a local (or relative)
minimum at x = b if there is an open interval I in which f (b)≤f (x) for all x in
I.