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Abstraction as Bread and Butter

I find first pages of a book as the most instructive ones for many reasons. When I look into a good book which I've read many years ago, I still find those first pages more interesting and inspiring.

Recently, I started reading a new book: "A Book of Abstract Algebra". Similarly, I found a very interesting statement in the introductory chapter:

Algebra at the more advanced level is often described as modern or abstract algebra. In fact, both of these descriptions are partly misleading. [...] To what extent is it abstract? Well, abstraction is all relative; one person's abstraction is another person's bread and butter.

-- Charles C Pinter, A Book of Abstract Algebra: Second Edition, pp. 1-2.

It is, indeed. Obviously, there is a lot to think on the abstraction of abstraction.