The #1 math textbook

The number one most popular maths textbook is Calculus by James Stewart. Last year it was assigned as essential reading in 10,000 university courses around the world. It has sold so many copies that it's author was able to spend 30 million dollars building a calculus inspired house, he called the integral house. It was also a concert hall, as Stewart was also a violinist, and that makes the violin on the cover make more sense. The pictures of the house are probably not much consolation to the students paying up to $250 for a copy of the book. Stewart died in 2014, and back then calculus was already selling over half a million copies a year. The popularity of this textbook does not mean it's the best, it just means the publisher has put in a lot of effort to ensure it is chosen as the assigned text. And they do this by creating homework and quiz systems that accompany the book to persuade course developers to use it. A full video about this book and other textbooks is on my youtube channel now.