[emilga]

> I agree with you that overly relying on flashcards will take away the intuition, which is critical in fields like mathematics.

Can't you just write a card that specifically asks you to give the intuition behind some concept?

E.g. "What's the intuitive interpretation of the gradient of a scalar field, \nabla \phi?" Answer: "\nabla \phi is a vector that points in the direction of greatest increase of \phi."

Etc.