Spivak's Calculus, oh, the memories! Logic at its finest. Definitely a nice maths book, as it is the place to learn how logical reasoning combined with fundamen

Spivak's Calculus, oh, the memories! Logic at its finest. Definitely a nice maths book, as it is the place to learn how logical reasoning combined with fundamental concepts can be developed into a rigorous mathematical theory rather than a bunch of tools and techniques learned by rote. Combine with the oldish, but still unbeatable in their clarity and charisma, video lectures by Herbert Gross and you can have tons of pure, free fun.