Item 9 (0013) — 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.

Middle-Four Exchange with Respect to Intersections. We have an isomorphism of sets
\[ \webleft (A\times B\webright )\cap \webleft (C\times D\webright )\cong \webleft (A\cap B\webright )\times \webleft (C\cap D\webright ). \]

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