Euler number
Integer sequence defined by the Taylor series expansion of the hyperbolic secant function and also appearing in that of the secant function
In mathematics, the Euler numbers are a sequence En of integers (sequence A122045 in the OEIS) defined by the Taylor series expansion 1 cosh t = 2 e t + e − t = ∑ n = 0 ∞ E n n ! ⋅ t n , {\displaystyle {\frac {1}{\cosh t}}={\frac {2}{e^{t}+e^{-t}}}=\sum _{n=0}^{\infty }{\frac {E_{n}}{n!}}\cdot t^{n},} where cosh ( t ) {\displaystyle \cosh(t)} is the hyperbolic cosine function. The Euler numbers are related to a special value of the Euler polynomials, namely E n = 2 n E n ( 1 2 ) . {\displaystyle E_{n}=2^{n}E_{n}({\tfrac {1}{2}}).} The Euler...
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Euler number
Integer sequence defined by the Taylor series expansion of the hyperbolic secant function and also appearing in that of the secant function
In mathematics, the Euler numbers are a sequence En of integers (sequence A122045 in the OEIS) defined by the Taylor series expansion 1 cosh t = 2 e t + e − t = ∑ n = 0 ∞ E n n ! ⋅ t n , {\displaystyle {\frac {1}{\cosh t}}={\frac {2}{e^{t}+e^{-t}}}=\sum _{n=0}^{\infty }{\frac {E_{n}}{n!}}\cdot t^{n},} where cosh ( t ) {\displaystyle \cosh(t)} is the hyperbolic cosine function. The Euler numbers are related to a special value of the Euler polynomials, namely E n = 2 n E n ( 1 2 ) . {\displaystyle E_{n}=2^{n}E_{n}({\tfrac {1}{2}}).} The Euler...
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From Wikipedia
In mathematics, the Euler numbers are a sequence En of integers (sequence A122045 in the OEIS) defined by the Taylor series expansion 1 cosh t = 2 e t + e − t = ∑ n = 0 ∞ E n n ! ⋅ t n , {\displaystyle {\frac {1}{\cosh t}}={\frac {2}{e^{t}+e^{-t}}}=\sum _{n=0}^{\infty }{\frac {E_{n}}{n!}}\cdot t^{n},} where cosh ( t ) {\displaystyle \cosh(t)} is the hyperbolic cosine function. The Euler numbers are related to a special value of the Euler polynomials, namely E n = 2 n E n ( 1 2 ) . {\displaystyle E_{n}=2^{n}E_{n}({\tfrac {1}{2}}).} The Euler numbers appear in the Taylor series expansions of the secant and hyperbolic secant functions. The latter is the function in the definition. They also occur in combinatorics, specifically when counting the number of alternating permutations of a set with an even number of elements.
Text: Wikipédia, CC BY-SA 4.0. ·
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