This belonged to my son. As you can see in the fourth photo, there's a faint crease on the cover. There's no writing or any signs of being opened, and it's in good condition. It may not have been used. Would anyone like it? Available for immediate purchase. I will ship it quickly. Linear Algebra, Academic Publishing House Hidenori Katsurada, Hiroto Takegahara Yuki Hasegawa, Hideaki Morita, co-authors List price: 2,200 yen