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/q/ - Quadrivium - '''Axiom''': For any set $X$ of nonempty sets, there exists a choice function $f$ that is defined on $X$ and maps each set of $X$ to an element of that set.Namely $f: X\to \bigcup X$ s.t. $f(x) \in x$.
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Debian is an operating system and a distribution of Free Software. It is maintained and updated through the work of many users who volunteer their time and effort.