===== Unary operation =====
==== Set ====
| @#55CCEE: context     | @#55CCEE: $X$ ... set |

| @#FFBB00: definiendum | @#FFBB00: $ f\in \text{it}(X) $ |

| @#AAFFAA: inclusion   | @#AAFFAA: $ f:X\to X $ | 

==== Discussion ====
=== Reference ===
Wikipedia: [[http://en.wikipedia.org/wiki/Unary_operation|Unary operation]]
==== Parents ====
=== Subset of ===
[[Binary relation on a set]], [[Function]]