Examples of Structural and Nonstructural Properties

In this video I define a structural property to be any property that must be shared by two isomorphic structures. Then I give examples of structural and nonstructural properties.
Structural Properties: cardinality, commutative binary operation
Nonstructural Properties: set contains the element 7, multiplication is the binary operation

[eiank]

Hey, your videos are super helpful and easy to understand. You should do more on abstract algebra and other fields as well.