Instant purchase is OK. This item has been handled by someone else. There is some wear and tear (such as folded covers and paper deterioration), but it should be usable without any problems. I used it with care as much as possible, but since I bought it at a low price, there is considerable wear and tear. I was thinking of getting rid of it, but I would be happy to give it to someone if they need it. "Mathematics I・A Introductory Problem Seikou" Yosuke Ikeda Price: ¥1200