We have an isomorphism of categories
\[ \mathrm{Rel}\cong \mathsf{FreeAlg}_{\mathcal{P}_{*}}\webleft (\mathsf{Sets}\webright ), \]
where $\mathcal{P}_{*}$ is the powerset monad of 
.
Here's a breakdown of the differences between each PDF style:
| 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.
We have an isomorphism of categories
where $\mathcal{P}_{*}$ is the powerset monad of .
Omitted.
