# Classification Is Just Classification
Properties that make X different from others do not mean those are
the essence of X. This is a very simple truth but quite many peopl
e confuse them. Especially in algebra related fields.
For example, the set of real numbers R is a
1. Complete
2. Ordered
3. Field
and these conditions make the set unique up to isomorphism. Then
are the conditions the essence of R, which means all other propert
ies are just details? Heck no. Your fingerprint is not your essenc
e.