where cosh t is the hyperbolic cosine. The Euler numbers appear as a special value of the Euler polynomials. The odd-indexed Euler numbers are all zero. The even-indexed ones {OEIS|id=A028296} have alternating signs. Some values are: Some authors re-index the sequence in order to omit the odd-numbered Euler numbers with value zero, and/or change a...
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http://en.wikipedia.org/wiki/Euler_number
[physics] The cavitation number has a similar structure, but a different meaning and use: ...
Found on
http://en.wikipedia.org/wiki/Euler_number_(physics)
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