Lemma 11.1.9.label Let $\cali{E}\suf\cali{M}(\cali{F})$ where $\cali{E},\cali{F}$ are families of subsets of $X$ then $\cali{M}(\cali{E})\suf \cali{M}(\cali{F})$
Lemma 11.1.9.label Let $\cali{E}\suf\cali{M}(\cali{F})$ where $\cali{E},\cali{F}$ are families of subsets of $X$ then $\cali{M}(\cali{E})\suf \cali{M}(\cali{F})$
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