## Sets

Abbreviation: Set

### Definition

A set is a structure $\mathbf{A}=\langle A\rangle$ with no operations or relations defined on $A$.

##### Morphisms

Let $\mathbf{A}$ and $\mathbf{B}$ be sets. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\rightarrow B$.

Example 1:

### Properties

Classtype variety decidable decidable decidable yes 2 no no no no no yes yes no yes yes yes

### Finite members

$\begin{array}{lr} f(n)= &1\\ \end{array}$

### Subclasses

[[One-element structures]]