In my experience undergraduate math textbooks are not like that at all. Perhaps for the introductory calculus sequence, but rarely for anything upper-division.

In my experience undergraduate math textbooks are not like that at all. Perhaps for the introductory calculus sequence, but rarely for anything upper-division. There are so many good textbooks for Algebra, Analysis, Topology and the most commonly taught ones are (Dummit&Foote, Rudin, Munkres) are nothing like what you describe.