"Norms appearing in the form of law entitle actors to exercise their rights or liberties. However, one cannot determine which of these laws are legitimate simply by looking at the form of individual rights. Only by bringing in the discourse principle can one show that each person is owed a right to the greatest possible measure of equal liberties that are mutually compatible."

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The book Dynamic Programming by Richard Bellman is an important, pioneering work in which a group of problems is collected together at the end of some chapters under the heading "Exercises and Research Problems," with extremely trivial questions appearing in the midst of deep, unsolved problems. It is rumored that someone once asked Dr. Bellman how to tell the exercises apart from the research problems, and he replied: "If you can solve it, it is an exercise; otherwise it's a research problem."

— Donald Knuth