If he had been a great and wise philosopher... he would now have comprehended that Work consists of whatever a body is obliged to do, and that Play consists of whatever a body is not obliged to do. And this would help him to understand why constructing artificial flowers or performing on a tread-mill is work, while rolling ten-pins or climbing Mont Blanc is only amusement.
— from The Adventures of Tom Sawyer by Mark Twain —
The point of all this is not the reduction of the familiar to the unfamiliar... but the extension of the familiar to cover many more cases.
— from Categories for the Working Mathematician by Saunders MacLane —
Of these three approaches, the last is in many ways the least satisfactory; it is, however, the one that we shall for the most part take.
— from "Lecture 9" of Representation Theory: A First Course by William Fulton and Joe Harris —
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- 179 Not especially famous, long-open problems which anyone can understand
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