Multivalued function

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An example of a multifunction: the input 3 is associated with both the output b and the output c.

A multivalued function (multifunction) is a relation like a function. A multifunction associates each input with at least one output.[1] A strict function associates each input with exactly one output. An example of a multivalued function is the square root. Every complex number (except for 0), has two square roots. Example: \sqrt{4} could be 2 or -2 because 2^2 = 4 and (-2)^2 = 4.

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