## Commutative ordered semigroups

Abbreviation: **COSgrp**

### Definition

A ** commutative ordered semigroups** is an ordered semigroup $\mathbf{A}=\langle A,\cdot,\le\rangle$ such that

$\cdot$ is ** commutative**: $xy=yx$

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It is not unusual to give several (equivalent) definitions. Ideally, one of the definitions would give an irredundant axiomatization that does not refer to other classes.

##### Morphisms

Let $\mathbf{A}$ and $\mathbf{B}$ be commutative ordered semigroups. A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\rightarrow B$ that is a orderpreserving homomorphism: $h(x \cdot y)=h(x) \cdot h(y)$ and $x\le y\Longrightarrow h(x)\le h(y)$

### Definition

A ** …** is a structure $\mathbf{A}=\langle A,...\rangle$ of type $\langle
...\rangle$ such that

$...$ is …: $axiom$

$...$ is …: $axiom$

### Examples

Example 1:

### Basic results

### Properties

Feel free to add or delete properties from this list. The list below may contain properties that are not relevant to the class that is being described.

### Finite members

$\begin{array}{lr} f(1)= &1\\ f(2)= &\\ f(3)= &\\ f(4)= &\\ f(5)= &\\ \end{array}$ $\begin{array}{lr} f(6)= &\\ f(7)= &\\ f(8)= &\\ f(9)= &\\ f(10)= &\\ \end{array}$

### Subclasses

[[Commutative ordered monoids]] expansion

### Superclasses

[[Ordered semigroups]] supervariety

[[Commutative semigroups]] subreduct

### References

Trace: » commutative_ordered_semigroups