Item 2 (00KZ) — 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.

Self-Duality II. We have a $2$-isomorphism
\[ \textbf{Rel}^{\mathsf{op}}\mathrel {\smash {\overset {\scriptscriptstyle \text{eq.}}\cong }}\textbf{Rel} \]

of $2$-categories.

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