Im a 2nd year physics/astronomy student in university. This app is well worth $0.99 and will be well used. A great substitute to digging through old text books or course notes for that formula/identity you cant quite exactly remember. Every physics/engineering/chemistry/computer science/math student should be issued this app along with their text books. Looking forward to the update, perhaps adding some astrophysical formula in there as well?
Damo R about Math Ref