## FANDOM

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Refer to this draft for more details.

Conjecture Let $S$ be a set of $\mathbf{Rel}$-morphisms. If $\forall X, Y \in S: \operatorname{up} (X \sqcap^{\mathsf{FCD}} Y) \subseteq S$ then $\operatorname{up} (X_0 \sqcap^{\mathsf{FCD}} \ldots \sqcap^{\mathsf{FCD}} X_n) \subseteq S$ for $X_i \in S$.

Trying to prove the above conjecture, first prove the following lemma:

Lemma For every funcoid $f$ and filter $\mathcal{X} \in \mathscr{F} (\operatorname{Src} f)$

$\operatorname{up} \langle f \rangle \mathcal{X} = \bigcup_{F \in \operatorname{up} f} \operatorname{up} \langle F \rangle \mathcal{X} = \left\{ K \in \operatorname{up} \langle F \rangle \mathcal{X} \mid F \in \operatorname{up} f \right\}.$