Lecture powerpoints are bad everywhere since you are meant to listen to the lecturer speaking about them, they aren't meant to be read independently like this.

Try to understand programming based on a programming lecture powerpoint, it is usually impossible.

Edit: Also you can't write code for what he is talking about in that lecture. Code cannot deal with infinities or continuous values. You'd get approximations which isn't the same thing, then you'd need to prove that those approximations are good enough which would have to be done without code anyway.