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.
Definition 2.1.4.1.1. [Pullbacks of Sets]
The pullback of $A$ and $B$ over $C$ along $f$ and $g$1 is the pullback of $A$ and $B$ over $C$ along $f$ and $g$ in $\mathsf{Sets}$ as in 
, .
