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— David van Dantzig"The attempt to apply rational arithmetic to a problem in geometry resulted in the first crisis in the history of mathematics. The two relatively simple problems -- the determination of the diagonal of a square and that of the circumference of a circle -- revealed the existence of new mathematical beings for which no place could be found within the rational domain."
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There is no division nor subtraction in the heart-arithmetic of a good mother. There are only addition and multiplication.
— Bess Streeter Aldrich
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Cardinal arithmetic will be quite important for us, so we spend some time on it. Since, however, it tends to be trivial, we shall not need to spend much of this time on proofs.
— Keith Devlin
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