> In calculus class, we learned very formal, epsilon-delta calculus (from Spivak's textbook). In physics, we learned from Feynman's Lectures on Physics. Did yo

> In calculus class, we learned very formal, epsilon-delta calculus (from Spivak's textbook). In physics, we learned from Feynman's Lectures on Physics. Did you ever consider that this is because your physics instructor new you were taking such a math class and didn't want to waste his time teaching you what someone else was already teaching you? If you spent all your time in physics classes learning rigorous math, you'd never get around to learning what physics is about. You'd have to get your math degree first.