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Mapping and functions .

  1. Feb 28, 2005 #1
    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:
  2. jcsd
  3. Feb 28, 2005 #2
    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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