Item 11 (003T) — 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.

1. Interaction With Characteristic Functions II. We have
$χ_{U \cup V} = χ_{U} + χ_{V} - χ_{U \cap V}$

for each $U, V \in P (X)$ .

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