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Arg max

In mathematics, arg max (or argmax) stands for the argument of the maximum, that is to say, the value of the given argument for which the value of the given expression attains its maximum value. This is well-defined only if the maximum is reached at a single value. Thus

x_0 = \arg \max_x f(x)

holds if and only if x0 is the unique value of x for which f(x) is maximized. So, for example,

\arg \max_{x \in \Bbb{R}} x(10-x) = 5

since the maximum value of x(10-x) is 25, which happens when x=5.

arg min (or argmin) is defined analogously.

See also
01-04-2007 01:16:19
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