===== Identity relation =====
==== Set ====
| $X$ |

^ $ \langle x,y\rangle \in\text{id}_X $ ^

| $ \langle x,y\rangle \in \text{unaryOp}(X) $ |

^ $ x=y $ ^

==== Ramifications ====
==== Reference ====
Mizar files: [[http://markun.cs.shinshu-u.ac.jp/mirror/mizar/JFM/Vol1/relat_1.html|RELAT_1]]

Wikipedia: [[http://en.wikipedia.org/wiki/Identity_relation|Equality]]

==== Parents ====
=== Subset of ===
[[Unary operation]]