"The only way to learn mathematics is to do mathematics."
docs.google.com/document/d/1V2RMSr-zFfnlhO8IGfWrjj_PGyNrmoswNm5LAC7aLgg/edit?usp=sharing
docs.google.com/document/d/1NfRlKHVDTGjAHsYmLPRS-XMMk2e1Q-GZw4QI7sdgagU/edit?usp=sharing