Textbook thread

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190KB, 449x395px

I'm preparing real analysis I using the independently written textbook from a professor in my university.
Until reaching the chapter on limits and continuous functions it wasn't that bad,
but afterwards its just steaming bullcrap as learning material

>proof limit of (g o f)(x)
>the book wants to be edgy and uses a personal definition of limit, not the standard epsilon-delta
>tells me to consider 4 different sets, with at least 6 intersections between them
>"let W = W0 intersect W1"
>doesn't define W0 because lol who cares
>4 intersection later it says "therefore W = W1 qed"
>also "we suggest the reader does the alternate proof as exercise"

I might be a brainlet but for me this is just sloppy and cheap explaining.
So let's have a textbook thread, because how things are written matters.