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That set is called the ranger of the function.
Discrete Function - A function that is defined only for a set of numbers that can be listed, such as the set of whole numbers or the set of integers. Explicit Definition - A definition of a function by a formula in terms of the variable.
It is the set which comprises the inputs to a function.
A function is a mapping from one set to another such that each element from the first set is mapped onto exactly one element from the second set.
Domain is a set in which the given function is valid and range is the set of all the values the function takes