Anonymous ID: 210792 Feb. 2, 2020, 4:16 a.m. No.8000144   ๐Ÿ—„๏ธ.is ๐Ÿ”—kun   >>0174

>>8000130

 

Ordinal number

In set theory, an ordinal number, or ordinal, is one generalization of the concept of a natural number that is used to describe a way to arrange a collection of objects in order, one after another. Any finite collection of objects can be put in order just by the process of counting: labeling the objects with distinct natural numbers