{ localUrl: '../page/function.html', arbitalUrl: 'https://arbital.com/p/function', rawJsonUrl: '../raw/3jy.json', likeableId: '2532', likeableType: 'page', myLikeValue: '0', likeCount: '5', dislikeCount: '0', likeScore: '5', individualLikes: [ 'EricBruylant', 'MYass', 'MalcolmMcCrimmon', 'EliTyre', 'EricRogstad' ], pageId: 'function', edit: '16', editSummary: '', prevEdit: '15', currentEdit: '16', wasPublished: 'true', type: 'wiki', title: 'Function', clickbait: '', textLength: '2093', alias: 'function', externalUrl: '', sortChildrenBy: 'likes', hasVote: 'false', voteType: '', votesAnonymous: 'false', editCreatorId: 'EricRogstad', editCreatedAt: '2016-06-08 19:21:49', pageCreatorId: 'NateSoares', pageCreatedAt: '2016-05-12 18:32:12', seeDomainId: '0', editDomainId: 'AlexeiAndreev', submitToDomainId: '0', isAutosave: 'false', isSnapshot: 'false', isLiveEdit: 'true', isMinorEdit: 'false', indirectTeacher: 'false', todoCount: '6', isEditorComment: 'false', isApprovedComment: 'true', isResolved: 'false', snapshotText: '', anchorContext: '', anchorText: '', anchorOffset: '0', mergedInto: '', isDeleted: 'false', viewCount: '181', text: 'Intuitively, a function $f$ is a procedure (or machine) that takes an input and performs some operations to produce an output. For example, the function "+" takes a pair of numbers as input and produces their sum as output: on input (3, 6) it produces 9 as output, on input (2, 18) it produces 20 as output, and so on.\n\nFormally, in mathematics, a function $f$ is a relationship between a [3jz set] $X$ of inputs and a set $Y$ of outputs, which relates each input to exactly one output. For example, $-$ is a function that relates the pair $(4, 3)$ to $1,$ and $(19, 2)$ to $17,$ and so on. In this case, the input set is all possible pairs of [number numbers], and the output set is numbers. We write [3vl $f : X \\to Y$] (and say "$f$ has the [type_mathematics type] $X$ to $Y$") to denote that $f$ is some function that relates inputs from the set $X$ to outputs from the set $Y$. For example, $- : (\\mathbb N \\times \\mathbb N) \\to \\mathbb N,$ which is read "subtraction is a function from [natural_number natural number]-pairs to natural numbers."\n\n$X$ is called the [3js domain] of $f.$ $Y$ is called the [3lg codomain] of $f$. We can visualize a function as a mapping between domain and codomain that takes every element of the domain to exactly one element of the codomain, as in the image below.\n\n![Domain, Codomain, and Image](http://i.imgur.com/ZZgVHaI.png)\n\n[fixme: Talk about how they're a pretty dang fundamental concept.]\n[fixme: Talk about how we can think of functions as mechanisms.]\n[fixme: Add pages on set theoretic and type theoretic formalizations.]\n[fixme: Talk about their relationships to programming.]\n[fixme: Talk about generalizations including partial functions, multifunctions, etc.]\n[fixme: Give some history, e.g. Church-Turing, Ackerman, recursion, etc. (Many of these todos should go into separate lenses; this definition here might be fine?)]\n\n# Examples\n\nThere is a function $f : \\mathbb{R} \\to \\mathbb{R}$ from the [real_number real numbers] to the real numbers which sends every real number to its square; symbolically, we can write $f(x) = x^2$. \n\n(TODO)', metaText: '', 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