我们知道,自然数、整数、有理数以及实数都可以排序,都能比较大小.但是复数能不能排序?为什么复数不能比较大小?本文对这些问题给予解答.事实上,顺序关系与大小关系是两种不同的关系,显然后者是与运算有关的顺序关系.那么在数学中什么是“序”呢?定义1如果集合E中的元素之间定义了一 We know that natural numbers, integers, rational numbers, and real numbers can be sorted, all of which can be sorted in size, but the complex numbers can not be sorted and why the plural numbers can not be compared in size. In fact, the relationship between order and size is two different It is clear that the latter is a sequence of operations related to the operation, then what is “sequence” in mathematics? Definition 1 If the elements in set E define a