John Derbyshire
Quote
Mathematicians call it “the arithmetic of congruences.” You can think of it as clock arithmetic. Temporarily replace the 12 on a clock face with 0. The 12 hours of the clock now read 0, 1, 2, 3, … up to 11. If the time is eight o’clock, and you add 9 hours, what do you get? Well, you get five o’clock. So in this arithmetic, 8 + 9 = 5; or, as mathematicians say, 8 + 9 ≡ 5 (mod 12), pronounced “eight plus nine is congruent to five, modulo twelve.
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Related word tools
Poet’s word, with inverted comma, for the end of the day
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E
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E
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N
Hint 1 meaning
The old plural of Eye.
Hint 2 anagram
NEE
Hint 3 another clue
AND STILL ___
9 +1