Functions: Different values of y for same value of x

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Is it possible to create a function that has two values of y for every one value of x, or is this an unbreakable rule of functions?
 
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ScienceNerd36 said:
Is it possible to create a function that has two values of y for every one value of x, or is this an unbreakable rule of functions?

Multivalued functions exist, but they're not functions.
 
Thanks :)
 

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