由于实数线可以被视为一个有序的空间，在目标空间中将只有唯一一个全局性的的最低点。
Since the real line can be considered an ordered space , there will be only one global minimum point in objective space .
在一个单一的目标函数的情况下，定义域映射对应的是实数线。
In the case of a single objective function , decision space is mapped to the real line .
实数线