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Quarter period : ウィキペディア英語版
Quarter period
In mathematics, the quarter periods ''K''(''m'') and i''K'' ′(''m'') are special functions that appear in the theory of elliptic functions.
The quarter periods ''K'' and i''K'' ′ are given by
:K(m)=\int_0^} \frac}K'(m) = } u\, and }K'\, .
The quarter periods are essentially the elliptic integral of the first kind, by making the substitution k^2=m\,. In this case, one writes K(k)\, instead of K(m)\,, understanding the difference between the two depends notationally on whether k\, or m\, is used. This notational difference has spawned a terminology to go with it:
* m\, is called the parameter
* m_1= 1-m \, is called the complementary parameter
* k\, is called the elliptic modulus
* k' \, is called the complementary elliptic modulus, where ^2=m_1\,\!
* \alpha\,\! the modular angle, where k=\sin \alpha\,\!
* \frac-\alpha\,\! the complementary modular angle. Note that
:m_1=\sin^2\left(\frac-\alpha\right)=\cos^2 \alpha.\,\!
The elliptic modulus can be expressed in terms of the quarter periods as
:k=\textrm (K+ K\,
where ns and dn Jacobian elliptic functions.
The nome q\, is given by
:q=e^}.\,
The complementary nome is given by
:q_1=e^}.\,
The real quarter period can be expressed as a Lambert series involving the nome:
:K=\frac + 2\pi\sum_^\infty \frac{1+q^{2n}}.\,
Additional expansions and relations can be found on the page for elliptic integrals.
==References==

* Milton Abramowitz and Irene A. Stegun, ''Handbook of Mathematical Functions'', (1964) Dover Publications, New York. ISBN 0-486-61272-4. See chapters 16 and 17.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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