Kant 4

"I shall confine my assertion to pure mathematics, they very concept of which implies that it contains pure a priori and not empirical cognition."

Kant I think is saying that Math is apriori. I find that hard to beleive based on the fact that we pretty much go through at least 12 years to learn the concepts of math. Math just doesnt make sense. Its not just something we know, we have to be taught it. We must practice it in order to understand.