Give him a coin, since he must profit by what he learns.
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Said to be a remark made to his servant when a student asked what he would get out of studying geometry.
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A slightly different translation of this remark (in which the coin is anachronistically referred to as 'threepence') is mentioned in The History of Greek Mathematics by Thomas Little Heath (1921), p. 357, where it is attributed to Stobaeus' Floril. iv, p. 205 (Floril. iv refers to volume iv of Stobaeus' Florilegium). The original Greek version of the anecdote can be read here, where it is mentioned that Stobaeus is quoting Serenus, or in the digitized copy of Florilegium on the Internet Archive here (if read online, set the slider at the bottom to location 600/723 to see p. 205, where the quote appears under heading 114).Euclid
In American culture the coin toss is the paradigm of the random event. A coin toss decides who kicks off the Super Bowl. Looked at another way, a coin toss is not random at all. It is physics.
William Poundstone
Punishments and rewards are two sides of the same coin and that coin doesn't buy you much.
Alfie Kohn
The probability of ten consecutive heads is 0.1 percent; thus, when you have millions of coin tossers, or investors, in the end there will be thousands of very successful practitioners of coin tossing, or stock picking.
Alan Greenspan
One learns better than to hand one's choices to fear. With age, with every wound and scar, one learns.
Lois McMaster Bujold
In reality, during the continuance of any one regulated proportion, between the respective values of the different values of the different metals in the coin, the value of the most precious metal regulates the value of the whole coin.
Adam Smith
Euclid
Euler, Leonhard
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