Item 13 (005L) — 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`
Style 4	`book`	Computer Modern	`amsthm`

*To be replaced with Linus Romer's Elemaints when it is released.

The Triangle Inequality for Symmetric Differences. We have
\[ U\mathbin {\triangle }W\subset U\mathbin {\triangle }V\cup V\mathbin {\triangle }W \]

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

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