I use this "annotated equation" technique in my own notes when I am working through mathematics. It's honestly kind of crazy to me that it isn't already standar

I use this "annotated equation" technique in my own notes when I am working through mathematics. It's honestly kind of crazy to me that it isn't already standard practice in mathematics texts. I can see how mathematicians might feel that it is inelegant, but it certainly helps with establishing an understanding.