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  text: 'In mathematics, the arrow $\\mapsto$ (which in [LaTeX] is called "\\mapsto") is used to describe what a [3jy function] does to an arbitrary input. It is commonly used in combination with [3vl colon-to notation], which describes what a function's [3js domain] and [3lg codomain] are. \n\nBy itself, $\\mapsto$ can be used to describe a function without naming it, and so is a way to describe [anonymous_function anonymous functions] in mathematics. \n\n# Examples\n\nThe function $f(x) = x^2$ from the [4bc real numbers] to the real numbers can be described using a combination of colon-to notation and mapsto notation as\n\n$$f : \\mathbb{R} \\to \\mathbb{R}$$\n$$x \\mapsto x^2.$$\n\nIn one line, although this is less common,\n\n$$f : \\mathbb{R} \\ni x \\mapsto x^2 \\in \\mathbb{R}.$$\n\n(see [3vq in notation]). ',
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