Calculus done right

Hey! I built this because I think calculus pedagogy has it backwards—most courses teach the "how" without the "why," leaving students computing mechanically without understanding what's actually happening. This resource takes a different approach: it puts differentials and linear maps front and center (instead of hiding them until multivariable), which I think clarifies a lot of confusion about what derivatives actually are. Part of a planned sequence covering undergraduate math (multivariable, linear algebra, etc.). Still learning and improving this—would love any feedback!