Editing DomainOfAFunction
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The domain of a function is the set of values for which the function is defined. When a function is defined by a formula the domain should be an integral part of the definition, although it is often implicit. For example, the function $f(x)=x^2$ could be defined over: * Positive integers, * All integers, * Rational numbers, * Algebraic numbers, * Real numbers, * Complex numbers, ... and more. In each case the same formula is used, but in each case the function is different.