The Integral House. Private residence of Jim Stewart, mathematician, textbook author.
My calculus book, handed down to me by my sister way back in 1980, was written by Earl Swokowski. I always liked that book - in fact, I still have it - and I go back and read sections of it from time to time when I need to brush up on a theorem or two. I have never been too critical about whether it was presenting proofs correctly or not. As a physicist, I usually want the answer; I'll leave the rigor to the mathematicians.
Jim Stewart also has written a calculus book, in recent years one of the best selling calculus books in the country. Now, if you write a calculus textbook, or a physics book, or chemistry, or biology, and many schools adopt that book and hundreds of thousands of undergraduates have to buy that book, well you're going to make a lot of money. Very few textbooks reach that level, however, although there are usually one or two in each field that become bestsellers. Sometimes that's because they are also classics (in the field of introductory physics, the "classics" are Sears & Zemansky, starting with their first edition right after WWII continuing to their 13th edition today, and which took a hands-on, practical approach, and Halliday & Resnick, developed in the early 1960s, and which was decidedly more theoretical). But also it could just be that it keeps enough of everyone's favorite topic so that university textbook selection committees find it's the only one they can agree on. I don't know if this happened with Stewart's calculus book, but it has been the case (or so I suspect) with certain physics textbooks.
After making millions with his textbooks, Stewart decided to commission his home, called "Integral House," because of... who knows, his love for math? People have debated the excellence of his calculus books - see the reviews on the amazon.com page for Spivak's calculus book for a taste - but sometimes a book doesn't have to be excellent to be good.
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