Item 5 (006C) — The Clowder Project

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Style 1	`book`	Alegreya Sans	`tcbthm`
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*To be replaced with Linus Romer's Elemaints when it is released.

Interaction With Unions II. We have
\[ \chi _{U\cup V}=\chi _{U}+\chi _{V}-\chi _{U\cap V} \]

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

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