I first thought the exact same thing as you. But this argument stretched to it's conclusion means no one know maths. Which very well might be your point. But th

I first thought the exact same thing as you. But this argument stretched to it's conclusion means no one know maths. Which very well might be your point. But then it loses any useful meaning. Even professional mathematicians are specialized in a small sub field of mathematics and there are huge parts they don't really know.