Purchased for a book report. Read only once. "Chasing the Mystery of Pi: The Challenge of Seki Takakazu, the Genius Mathematician of the Edo Period" Kaze Narumi / Takayuki Ino Price: ¥1500 Please note that this is a used item. Due to the nature of used items, the condition of the book (e.g., sun damage) may differ slightly from the photos depending on the lighting and angle. We appreciate your understanding. Please refrain from purchasing if you are overly concerned about the condition or are particularly sensitive to such matters.