"Cambridge Notes" is a collection of mathematical works of the famous English mathematician and physicist Walter William Rouse Ball. In this book, the author, using the current mathematical and scientific information available to him, considers a variety of issues from different branches of mathematics. Known for his high erudition and deep understanding of scientific problems, Ball explains complex mathematical concepts in a way that is accessible to a wide audience. Cambridge Notes is an essential book for anyone interested in mathematics, science and education.