Item 13 (01KT) — The Clowder Project

Style	Class	Font	Theorem Environments
Style 1	`book`	Alegreya Sans	`tcbthm`
Style 2	`book`	Alegreya Sans	`amsthm`
Style 3	`book`	Arno*	`amsthm`
Style 4	`book`	Computer Modern	`amsthm`

Interaction With Binary Unions. We have equalities of sets
\begin{align*} \webleft [U\cap V,W\webright ]_{X} & = \webleft [U,W\webright ]_{X}\cup \webleft [V,W\webright ]_{X},\\ \webleft [U,V\cap W\webright ]_{X} & = \webleft [U,V\webright ]_{X}\cap \webleft [U,W\webright ]_{X} \end{align*}

for each $U,V,W\in \mathcal{P}\webleft (X\webright )$.

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