The author has an axe to grind. There is a lot argumentation by assertion going on. Here’s a part that makes it hard to take this post seriously. How did New

The author has an axe to grind. There is a lot argumentation by assertion going on. Here’s a part that makes it hard to take this post seriously. How did Newton and Leibniz discover the calculus without understanding it? Because Europeans stole the calculus from India, in connection with their navigational problem, and didn’t acknowledge the theft. Does that make a difference to teaching calculus? Yes, because knowledge thieves often fail to understand what they steal. It is certainly the case that calculus is well understood these days and no one alive was involved in the “theft” of calculus. Calculus is quite intuitive and the concepts are not hard to understand. For the most part things work the way one expects and so a great deal could be accomplished working intuitively. However, in the 1800s pathological examples were discovered and the need to put the subject on a firm footing arose. What is telling in the post is the lack of examples. I haven’t read the whole post so I could be wrong but the author sounds like a crank.