Sorry, I wasn't talking about Velleman's book on whatever, I was just challenging the sentiment that you should learn the "basics of proof based math" before li

Sorry, I wasn't talking about Velleman's book on whatever, I was just challenging the sentiment that you should learn the "basics of proof based math" before linear algebra. Linear algebra is the basics of proof based math. Edit: I should clarify that I believe that there are many approaches to learning mathematics, I'm sure that Velleman's book is fine, just that it isn't true that you should not try to learn from Axler, although perhaps someone who has a bit less of an axe to grind.