- sum set, axiom of
- The axiom of Zermelo–Fraenkel set theory providing that for each set S the collection
*x*:(∃*y*)(*y*∈ S &*x*∈*y*), the union of S, is a set.

*Philosophy dictionary.
Academic.
2011.*

- sum set, axiom of
- The axiom of Zermelo–Fraenkel set theory providing that for each set S the collection
*x*:(∃*y*)(*y*∈ S &*x*∈*y*), the union of S, is a set.

*Philosophy dictionary.
Academic.
2011.*

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