So it's like Calculus textbooks. 13th edition versus 12th edition: let's add 8 pages of new contents, mostly about the early life of Leibniz, but most important

So it's like Calculus textbooks. 13th edition versus 12th edition: let's add 8 pages of new contents, mostly about the early life of Leibniz, but most importantly, let's scramble all the exercise numbers.