I bought "Linear Algebra with Applications by Gareth Williams" 5th or 6th edition on ebay for 6 bucks. It's very simple and operative (manual matrix calc so you

I bought "Linear Algebra with Applications by Gareth Williams" 5th or 6th edition on ebay for 6 bucks. It's very simple and operative (manual matrix calc so you don't stay stuck in fuzzy terminology for too long). It's so easy I'm not even sure it's proper undergrad level. But it deeply unlocked my brain on the topic..