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@@ -8,7 +8,7 @@
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\item[(P1)] $\emptyset \in \ce$.
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\item[(P2)] For any $A, B \in \ce$, $A \cap B \in \ce$.
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\item[(E)] For any $E, F \in \ce$ with $E \subset F$, there exists $\seqf{E_j} \subset \ce$ such that $E \setminus F = \bigsqcup_{j = 1}^n E_j$.
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\end\{enumerate\}
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\end{enumerate}
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If $X \in \ce$, then (E) may be replaced with
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\begin{enumerate}
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