----
> [!definition] Definition. ([[relation]])
> A **relation** on a set $A$ is a subset $C$ of the [[cartesian product]] $A \times A$.
\
For a **relation** $C \subset A \times A$ we use the notation $xCy$ to indicate $(x,y)\in C$, read "$x$ is in the relation $C$ to $y
quot;.
----
####
----
#### References
> [!backlink]
> ```dataview
> TABLE rows.file.link as "Further Reading"
> FROM [[]]
> FLATTEN file.tags as Tag
> WHERE Tag = "#definition" OR Tag = "#theorem" OR Tag = "#MOC" OR Tag = "#proposition" OR Tag = "#axiom"
> GROUP BY Tag
> ```
> [!frontlink]
> ```dataview
> TABLE rows.file.link as "Further Reading"
> FROM outgoing([[]])
> FLATTEN file.tags as Tag
> WHERE Tag = "#definition" OR Tag = "#theorem" OR Tag = "#MOC" OR Tag = "#proposition" OR Tag = "#axiom"
> GROUP BY Tag
> ```