Item 2 (005A) — The Clowder Project

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Style	Class	Font	Theorem Environments
Style 1	`book`	Alegreya Sans	`tcbthm`
Style 2	`book`	Alegreya Sans	`amsthm`
Style 3	`book`	Arno*	`amsthm`
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*To be replaced with Linus Romer's Elemaints when it is released.

Via Unions and Intersections. We have
\[ U\mathbin {\triangle }V=\webleft (U\cup V\webright )\setminus \webleft (U\cap V\webright ) \]

for each $U,V\in \mathcal{P}\webleft (X\webright )$, as in the Venn diagram

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