th3roman

Hey its th3roman here, just registered. Have a huge interest in mathematics and the sciences. I wanna ask, what are the subjects that I need to learn and understand to be able to read and understand mathematics, engineering and sciences like astronomy. What subjects I mean by are the principle areas that I have to know before being able to do mathematics and sciences at a technical level. Understanding formulas and such. It'd be a great help if someone points me to the right direction. Thanks