No, not really. I don't expect him to know EVERY math technique. He knows many. Too many, possibly... But he could easily know all the ones used in the show

No, not really. I don't expect him to know EVERY math technique. He knows many. Too many, possibly... But he could easily know all the ones used in the show, if that were his focus in life. Likewise, a linguist would know the differences between languages without actually being able to speak all the languages in the world. If a relatively-unknown language had a special property that no other language did, I'd expect serious linguists to know that. Eventually, anyhow.