定义为： 上的二元关系定义为关系称为由 诱导出的无差异关系（indifference relation）；当 已经明确时，也可将简称 1 2 1 2为无差异关系。x x 读作“x 和 x 无差异” 。
双语例句
1
An indifferencerelation derived this way will generally not be transitive.
这种方法得到的无差异关系通常不会被传递。
2
In the case of diversity of variety each diverse member exhibited an indifference to every other, and they had no other relation to each other, save what was given by a comparison external to them.