Definition 7.1.2 (Covering).label Let $X$ be a set and $\sigma \subset 2^{X}$, then $\sigma$ covers $X$/is covering if $\bigcup_{E \in \sigma}E = X$.
Definition 7.1.2 (Covering).label Let $X$ be a set and $\sigma \subset 2^{X}$, then $\sigma$ covers $X$/is covering if $\bigcup_{E \in \sigma}E = X$.
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