Definition 7.1.3 (Fundamental).label Let $X$ be a set, $\sigma \subset 2^{X}$ be an ideal, and $\tau \subset \sigma$, then $\tau$ is fundamental with respect to $\sigma$ if for any $E \in \sigma$, there exists $F \in \tau$ such that $E \subset F$.
Definition 7.1.3 (Fundamental).label Let $X$ be a set, $\sigma \subset 2^{X}$ be an ideal, and $\tau \subset \sigma$, then $\tau$ is fundamental with respect to $\sigma$ if for any $E \in \sigma$, there exists $F \in \tau$ such that $E \subset F$.
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