This is a problem collection from the International Mathematical Olympiad, featuring problems from 2011 to 2015. - Title: Mathematical Olympiad 2011-2015 - Language: Japanese - Content: Problem collection from the International Mathematical Olympiad - ISBN: 978-4-535-78795-7 - Publisher: Nihon Hyoronsha - Price: 2200 yen + tax - Release Date: September 25, 2015 I found this while tidying up. It appears to be unused, unless I missed something (apologies if I did). Please understand that it has been stored at home. Feel free to ask any questions before purchasing. I am also listing this elsewhere, so it may be removed. Thank you for looking.