## Unary operation

### Set

context | $X$ … set |

definiendum | $ f\in \text{it}(X) $ |

inclusion | $ f:X\to X $ |

### Discussion

#### Reference

Wikipedia: Unary operation

context | $X$ … set |

definiendum | $ f\in \text{it}(X) $ |

inclusion | $ f:X\to X $ |

Wikipedia: Unary operation