/sci/ - Science & Math

I am a sophomore and this is my first time taking linear algebra, my teacher is using a graduate textbook from 39 years ago (https://www.amazon.com/Linear-Algebra-Graduate-Texts-Mathematics/dp/0387901108/ref=sr_1_2?keywords=greub+linear+algebra&qid=1583050588&sr=8-2)) We just started and already I see strange notation (pic related), this is fine I can work through it. I am a math major and I want to learn linear algebra right, but this seems too advanced. This is my only class this semester, so I am prepared to work 8 hours a day. Should I stick it out or drop.