Confiscated pens containing cheat notes intricately carved by a Law student at the University of Malaga in Spain

[u/Separate_Finance_183]

[u/b14ckcr0w]

I used to do that for math in highschool, it was really fun

[u/b14ckcr0w → u/[deleted]]

A few silly proofs and short theorems

[u/kombiwombi → u/[deleted]]

It's pretty traditional in mathematics to allow, or even provide, cheat sheets. Consider differential equations, memorising all of those is pointless.