Calculus

You dont need infinities and calculus to do 3D graphics and video games.

Here is why:
http://www.youtube.com/watch?v=Oe2DZc6BXZk

that is, all the trigonometry you learned at school was a waste of your time, as it could be replaced with linear algebra.

It is often said that Turing machines, unlike simpler automata, are as powerful as real machines, and are able to execute any operation that a real program can. What is missed in this statement is that, because a real machine can only be in finitely many configurations, in fact this "real machine" is nothing but a linear bounded automaton. On the other hand, Turing machines are equivalent to machines that have an unlimited amount of storage space for their computations. In fact, Turing machines are not intended to model computers