Category:Ordered Integral Domains
This category contains results about Ordered Integral Domains.
Definitions specific to this category can be found in Definitions/Ordered Integral Domains.
Definition 1
An ordered integral domain is an integral domain $\struct {D, +, \times}$ which has a strict positivity property $P$:
\((\text P 1)\) | $:$ | Closure under Ring Addition: | \(\displaystyle \forall a, b \in D:\) | \(\displaystyle \map P a \land \map P b \implies \map P {a + b} \) | ||||
\((\text P 2)\) | $:$ | Closure under Ring Product: | \(\displaystyle \forall a, b \in D:\) | \(\displaystyle \map P a \land \map P b \implies \map P {a \times b} \) | ||||
\((\text P 3)\) | $:$ | Trichotomy Law: | \(\displaystyle \forall a \in D:\) | \(\displaystyle \paren {\map P a} \lor \paren {\map P {-a} } \lor \paren {a = 0_D} \) | ||||
For $\text P 3$, exactly one condition applies for all $a \in D$. |
Definition 2
An ordered integral domain is an ordered ring $\struct {D, +, \times, \le}$ which is also an integral domain.
That is, it is an integral domain with an ordering $\le$ compatible with the ring structure of $\struct {D, +, \times}$:
\((\text {OID} 1)\) | $:$ | $\le$ is compatible with ring addition: | \(\displaystyle \forall a, b, c \in D:\) | \(\displaystyle a \le b \) | \(\displaystyle \implies \) | \(\displaystyle \paren {a + c} \le \paren {b + c} \) | ||
\((\text {OID} 2)\) | $:$ | Strict positivity is closed under ring product: | \(\displaystyle \forall a, b \in D:\) | \(\displaystyle 0_D \le a, 0_D \le b \) | \(\displaystyle \implies \) | \(\displaystyle 0_D \le a \times b \) |
An ordered integral domain can be denoted:
- $\struct {D, +, \times \le}$
where $\le$ is the total ordering induced by the strict positivity property.
Subcategories
This category has the following 3 subcategories, out of 3 total.
R
W
Pages in category "Ordered Integral Domains"
The following 28 pages are in this category, out of 28 total.
G
P
R
- Rational Numbers form Ordered Integral Domain
- Real Numbers form Ordered Integral Domain
- Relation Induced by Strict Positivity Property is Asymmetric and Antireflexive
- Relation Induced by Strict Positivity Property is Compatible with Addition
- Relation Induced by Strict Positivity Property is Compatible with Addition/Corollary
- Relation Induced by Strict Positivity Property is Compatible with Multiplication
- Relation Induced by Strict Positivity Property is Transitive
- Relation Induced by Strict Positivity Property is Trichotomy
- Ring of Integers Modulo m cannot be Ordered Integral Domain
S
- Square of Element Less than Unity in Ordered Integral Domain
- Square of Non-Zero Element of Ordered Integral Domain is Strictly Positive
- Strict Negativity is equivalent to Strict Positivity of Negative
- Strict Negativity is equivalent to Strictly Preceding Zero
- Strict Positivity Property induces Total Ordering
- Sum of Strictly Negative Elements is Strictly Negative