| 单词 | global minimum |
| 释义 | global minimum A value of a function as low as or lower than that for any other values of its arguments. The sufficient condition for a minimum of a function of a single argument, in terms of a zero first and positive second derivative, shows only that the function takes a local minimum. In some special cases it can be shown that a function has only one stationary value: for example, a quadratic, whose second derivative is constant. In this case any local minimum must also be global. In other cases it is necessary to check whether or not a given minimum is global. The function y = ax3 - bx, for example, where both a and b are positive, has stationary values at See also: maximum |
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