Definition:Closure under Chain Unions
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Let $A$ be a class.
$A$ is closed under chain unions if and only if:
where $\bigcup C$ denotes the union of $C$
- Results about closure under chain unions can be found here.
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $4$: Superinduction, Well Ordering and Choice: Part $\text I$ -- Superinduction and Well Ordering: $\S 2$ Superinduction and double superinduction