Hitotsubashi University Mathematics: 15 Years [6th Edition] Edited by the Mathematics Society Editorial Department From 2003 to 2017 This book contains all 77 math problems from Hitotsubashi University (first-stage program) for the 15 years from 2003 to 2017. There is one instance of writing in the book (photo 2). I apologize if I missed anything. Also, it appears water was spilled on the book, causing wrinkles and warping on the bottom of about half the pages. I apologize that it is difficult to see in the photos. (Photos 4 and 5) Please understand that this is a used item before purchasing.