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A function is a relation whose mapping is a bijection.
It is simply a mapping. It could be a function but there are several conditions that need to be met before the mapping can become a function and there is no basis for assuming that those conditions are met.
A mapping is a function.f: A -> BThis statement says f is a function and it maps from set A to set B.In order for f to be a function, for every element of A, there must exist uniquely f(a) in B.
A mapping. It need not be a function.
A function is a relation whose mapping is a bijection.