The domain of a function is simply the x values of the function
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A sequence is a function with domain a set of successive integers
The domain is a subset of the values for which the function is defined. The range is the set of values that the function takes as the argument of the function takes all the values in the domain.
Range often is used when talking about functions. We are allowed to put certain values into the function and the collection of all these values is the function's domain and certain numbers come out of the function and these are its range.
The domain is the possible values that can be input into the function and produce a real number output.
It would appear that the domain is so very limited that the function may not be seen!