Commutative ordered rings

Abbreviation: CORng

Definition

A commutative ordered ring is an ordered ring $\mathbf{A}=\langle A,+,-,0,\cdot,\le\rangle$ 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 … . A morphism from $\mathbf{A}$ to $\mathbf{B}$ is a function $h:A\rightarrow B$ that is a orderpreserving homomorphism: $h(x + y)=h(x) + h(y)$, $h(x \cdot y)=h(x) \cdot h(y)$, 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

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

[[Ordered fields]] expansion

Superclasses

[[Ordered rings]] supervariety
[[Commutative rings]] subreduct

References