While the claim in the preface that a great deal of the book requires no calculus is correct, I found that some of the very important theorems in the book depen

While the claim in the preface that a great deal of the book requires no calculus is correct, I found that some of the very important theorems in the book depend heavily on calculus. Further, as soon as the text begins discussing analytic continuation of the zeta function, there is heavy usage of contour integrals. I had to brush up on complex analysis in order to make sense of the text. In case anyone is interested, I have taken a large number of notes that illustrate many theorems in the book with concrete examples. These examples may help in "visualizing" the theorems. The notes are available here: https://offbeat.cc/iant/boards/ https://offbeat.cc/iant/boards/. These notes also elaborate several intermediate steps of various proofs that are not explicitly expressed in the book.