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  "body": "\n## Summary\n\nA unary operation on a set $A$ is a [[finitary operation|EJ8YJVM9BW]] of [[arity|MSXX2P86CY]] $1$, that is, a function from $A$ to $A$.\nNegation of numbers, the inverse in a [[group|G5S1M9]] and the complement of a set are unary operations.\nAn algebra whose operations are all unary is a [[unary algebra|XD10P9CJMD]].\n\n## Explanations\n\n### L1 human\n\nA unary operation takes one element and gives back one element of the same set.\nOn the integers, $x \\mapsto -x$ and $x \\mapsto x + 1$ are unary operations.\nOn the subsets of a fixed set $X$, taking the complement $Y \\mapsto X \\setminus Y$ is a unary operation.\nThe square root is not a unary operation on the real numbers, because $\\sqrt{-1}$ is not a real number.\n",
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