Category:Countably Infinite
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This category contains results about Countably Infinite.
Definitions specific to this category can be found in Definitions/Countably Infinite.
Countably Infinite Set
Let $S$ be a set.
$S$ is countably infinite if and only if there exists a bijection:
- $f: S \to \N$
where $\N$ is the set of natural numbers.
Countably Infinite Class
Let $A$ be a class.
$A$ is countably infinite if and only if there exists a bijection:
- $f: S \to \N$
where $\N$ is the set of natural numbers.
Subcategories
This category has only the following subcategory.
C
- Countably Infinite Classes (empty)
Pages in category "Countably Infinite"
The following 2 pages are in this category, out of 2 total.