Real Analysis: A Long-Form Mathematics Textbook by Jay Cummings. It's a very brisk read and lacks that heavy-handed feel you get from even looking at math books. That said, it's been edited by bajillion people (mostly students), yet it does have a decent number of non-trivial mistakes (which can be cleared up by asking a question on mathstackexchange, for example).
Real Analysis: A Long-Form Mathematics Textbook by Jay Cummings. It's a very brisk read and lacks that heavy-handed feel you get from even looking at math books. That said, it's been edited by bajillion people (mostly students), yet it does have a decent number of non-trivial mistakes (which can be cleared up by asking a question on mathstackexchange, for example).