Arbitrary union
Set
| context | $ S\in \mathfrak U $ |
| definiendum | $ x\in \bigcup S $ |
| range | $ X\in S $ |
| postulate | $ \exists X.\ x\in X $ |
Discussion
Reference
Wikipedia: Arbitrary union
| context | $ S\in \mathfrak U $ |
| definiendum | $ x\in \bigcup S $ |
| range | $ X\in S $ |
| postulate | $ \exists X.\ x\in X $ |
Wikipedia: Arbitrary union