Isomorphism class

An isomorphism class is a collection of mathematical objects isomorphic with a certain mathematical object. A mathematical objects usually consists of a set and some mathematical relations and operations defined over this set.

Isomorphism classes are often defined if the exact identity of the elements of the set is considered irrelevant, and the properties of the structure of the mathematical object are studied.

Examples of this are Ordinals and [Mathematical graph]?s.