I have just received this book hours ago. It is paperback.  I breezed through book with skimreading at first. Simple illustrations with few colours — VERY HELPFUL. The page layout is perfect, very easy on my eyes! I could read quickly, as the text is not too cluttered. I have learned maths fast. Thank you, authors.<br>Moreover, I absolutely love the 4cm margins at the outer edges of pages, as I like pencilling my notes in blank spaces or place sticky notes there. Helpful footnotes in the margins.