An **integer-valued function** is a function whose outputs are always integers. This means that for every input value from its domain, the corresponding output value is an integer. Formally, if \( f: A \rightarrow \mathbb{Z} \), where \( A \) is a set (the domain of the function), and \( \mathbb{Z} \) is the set of all integers, then \( f \) is an integer-valued function.

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