The width of DIV is not the absolute value, but rather the minimum width.
DIV的宽度不是绝对的，而是最小宽度。
The assumption that investors are absolute risk aversion, its value is designed to minimize the risks, which can be minimum variance under the hedging rate.
假定投资者是绝对的风险厌恶者，其保值的目的是为了将风险最小化，由此可以得到最小方差下的套期保值比率。
If the value is less than or equal to all other function values, it is an absolute minimum.
如果这个值小于或等于所有其它的函数值，那它就是绝对极小值。
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