• Some people think that mathematics is a serious business that must always be cold and dry; but we think mathematics is fun, and we aren't ashamed to admit the fact. Why should a strict boundary line be drawn between work and play? Concrete mathematics is full of appealing patterns; the manipulations are not always easy, but the answers can be astonishingly attractive.

    Ronald L. Graham, Donald Ervin Knuth, Oren Patashnik (1989). “Concrete mathematics: a foundation for computer science”, Addison Wesley Publishing Company
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