At some point during my undergraduate degree (Bachelor of Science in Astrophysics, with a Bachelor of Arts in Creative Writing) I thought, "wouldn't it be cool if I collected all the physics and maths formulae I've learnt into a notebook?" This became three notebooks, then, when I realised how untidy they were getting, a LaTeX document. In the hope that others might find it useful, I decided to put it up here. Three years after it began, here it is!