Comment by skydhash

I was pretty upset when my algebra professor tried to make us learn proof about n-dimensions matrices and what not. It was an undergraduate engineering degree and the vast majority of the formulas would mostly have up to 3 or 4 dimensions. That derailed the whole year (it's not like maths was the only subject). Complete proofs and theorems have their places, but learning stuff do need levels. The spherical model of the earth is good enough in 2nd grade (when we were first learning about geography (continents, seas, mountains, plains,...)), no need to do a full treatise there.