I appreciate your response and edit to the post; that was an admirably quick turn-around time! However, I think that, in the context of the article, TheLoneWolfling (https://news.ycombinator.com/item?id=9654767 )'s comment is more important than mine: a mention of non-linear equations and the difficulty of their solution is highly relevant and appropriate, as long as you don't imply the theoretical impossibility of their solution.