Item 11 (005K) — 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.

“Transitivity”. We have
\[ \webleft (U\mathbin {\triangle }V\webright )\mathbin {\triangle }\webleft (V\mathbin {\triangle }W\webright )=U\mathbin {\triangle }W \]

for each $X\in \text{Obj}\webleft (\mathsf{Sets}\webright )$ and each $U,V,W\in \mathcal{P}\webleft (X\webright )$.

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