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Foundations of Mathematics

Set Theory

How else is the term function used?

Unfortunately (as with many mathematical terms), there is often more than one function for the word “function.” For example, contrary to the definition above, function can also mean the relationships that map single points in the domain to multiple points in the range—called multivalued functions—mainly used in the theory of complex functions. To further confuse matters, there are also functions called non-multivalued functions.



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