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Sometimes, particularly in Object-oriented Programming , the comparison raises questions of Datatype s and Inheritance , Equality and Identity . It is often necessary to distinguish between:
  • two objects with different datatypes both related to another datatype, e.g. an orange and a lemon, both being citrus fruit

  • two different objects of the same type, e.g. two hands

  • two objects being equal but distinct, e.g. two $10 banknotes

  • two different references to the same object, e.g. two nicknames for the same person


Sameness and difference can be relative or graduated as well as absolute, particularly in Fuzzy Logic , Artificial Intelligence , Signal Processing , Lossy Data Compression and Pattern Recognition .


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