Definition 19.3.3 (Generated $\lambda$-System).label Let $X$ be a set and $\ce \subset 2^{X}$, then the smallest $\lambda$-system $\lambda(\ce)$ over $X$ containing $\ce$ is the $\lambda$-system generated by $\ce$.
Definition 19.3.3 (Generated $\lambda$-System).label Let $X$ be a set and $\ce \subset 2^{X}$, then the smallest $\lambda$-system $\lambda(\ce)$ over $X$ containing $\ce$ is the $\lambda$-system generated by $\ce$.
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