Why do we separate one-to-one and many-to-one mappings?

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Cheman
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Mapping and functions...

Why do were define one-one and many-one mappings as functions? Why do we separate them into a different group and make them special?

Thanks in advance. :smile:
 

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1-1 functions allow us to compare sets. Also, 1-1 functions are invertible on the image of their domain. Invertibility is a "nice" feature in many areas of study.
 

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