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The domain of a function is the set of input values for which the function is defined. The domain does not normally have a single value as such, but will typically be described through one or more intervals.

For example, consider the real function f(x) := 1 / x.

f is defined for all real values of x except zero, so the domain of f will be the combination of two intervals -infinity < x < 0 and 0 < x < +infinity.

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