This is a pure gem. It's like turning a prose into an abstract syntax tree for a human parser. :) I do think it adds to the clarity for the examples presented i

This is a pure gem. It's like turning a prose into an abstract syntax tree for a human parser. :) I do think it adds to the clarity for the examples presented in it. But whether it applies well to more complicated proofs (those spanning hundreds of pages in a math paper) remains to be seen. I think at least writers of introductory textbook could adopt the style to benefit beginner students.