In Mathematics
The number 13 is the sixth prime number, and the smallest emirp (prime which is a different prime when reversed). It is also a Fibonacci number, a happy number, and one of only 3 known Wilson primes.
Since 52 + 122 = 132, (5, 12, 13) forms a Pythagorean triple.
There are 13 Archimedean solids, and a standard torus can be sliced into 13 pieces with just 3 plane cuts.
Read more about this topic: 13 (number)
Famous quotes containing the word mathematics:
“I must study politics and war that my sons may have liberty to study mathematics and philosophy.”
—John Adams (1735–1826)
“In mathematics he was greater
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For he, by geometric scale,
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Resolve, by sines and tangents straight,
If bread and butter wanted weight;
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—Samuel Butler (1612–1680)