Free and Open-Source Mathematics Textbooks
Everyone likes free stuff, and there&#x27;s nothing wrong with this kind of list per se, but I do think there&#x27;s a trap here lurking for some people. That is, it&#x27;s easy to find a free resource appealing. You can grab dozens of free texts of material you&#x27;d like to understand!<p>_But_ because old texts are pretty cheaply available (because publishers love making new editions with trivial changes like tweaked exercises, and because math doesn&#x27;t really go stale), almost always the cost of acquiring a non-free book can is waaay less than the time you&#x27;d spend to read it, do problems, and really understand the material. Caring too much about &quot;free&quot; is letting the tail wag the dog.