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28 Mathieu Functions and Hill’s EquationModified Mathieu Functions

§28.28 Integrals, Integral Representations, and Integral Equations

Contents

§28.28(i) Equations with Elementary Kernels

Let

Then

In (28.28.7)–(28.28.9) the paths of integration \mathcal{L}_{j} are given by

28.28.6
\mathcal{L}_{1}\mbox{ : from }-\eta_{1}+i\infty\mbox{ to }2\pi-\eta_{1}+i\infty,
\mathcal{L}_{3}\mbox{ : from }-\eta_{1}+i\infty\mbox{ to }\eta_{2}-i\infty,
\mathcal{L}_{4}\mbox{ : from }\eta_{2}-i\infty\mbox{ to }2\pi-\eta_{1}+i\infty,

where \eta_{1} and \eta_{2} are real constants.

In (28.28.11)–(28.28.14)

In particular, when h>0 the integrals (28.28.11), (28.28.14) converge absolutely and uniformly in the half strip \realpart{z}\geq 0, 0\leq\imagpart{z}\leq\pi.

where the upper or lower sign is taken according as 0\leq y\leq\pi or \pi\leq y\leq 2\pi. For A_{0}^{{2n}}(q) and C_{{2n}}(q) see §§28.4 and 28.5(i).

For details and further equations see Meixner et al. (1980, §2.1.1) and Sips (1970).

§28.28(ii) Integrals of Products with Bessel Functions

In particular, for integer \nu and \ell=0,1,2,\dots,

where again \varepsilon_{0}=2 and \varepsilon_{\ell}=1, \ell=1,2,3,\ldots.

§28.28(iii) Integrals of Products of Mathieu Functions of Noninteger Order

With the parameter h suppressed we use the notation

28.28.24
\mathop{\mathrm{D}_{{0}}\/}\nolimits\!\left(\nu,\mu,z\right)=\mathop{{\mathrm{%
M}^{{(3)}}_{{\nu}}}\/}\nolimits\!\left(z\right)\mathop{{\mathrm{M}^{{(4)}}_{{%
\mu}}}\/}\nolimits\!\left(z\right)-\mathop{{\mathrm{M}^{{(4)}}_{{\nu}}}\/}%
\nolimits\!\left(z\right)\mathop{{\mathrm{M}^{{(3)}}_{{\mu}}}\/}\nolimits\!%
\left(z\right),
\mathop{\mathrm{D}_{{1}}\/}\nolimits\!\left(\nu,\mu,z\right)={\mathop{{\mathrm%
{M}^{{(3)}}_{{\nu}}}\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{M%
}^{{(4)}}_{{\mu}}}\/}\nolimits\!\left(z\right)-{\mathop{{\mathrm{M}^{{(4)}}_{{%
\nu}}}\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{M}^{{(3)}}_{{%
\mu}}}\/}\nolimits\!\left(z\right),

and assume \nu\notin\Integer and m\in\Integer. Then

where

where

§28.28(iv) Integrals of Products of Mathieu Functions of Integer Order

Let

28.28.39
\mathop{\mathrm{Dc}_{{0}}\/}\nolimits\!\left(n,m,z\right)=\mathop{{\mathrm{Mc}%
^{{(3)}}_{{n}}}\/}\nolimits\!\left(z\right)\mathop{{\mathrm{Mc}^{{(4)}}_{{m}}}%
\/}\nolimits\!\left(z\right)-\mathop{{\mathrm{Mc}^{{(4)}}_{{n}}}\/}\nolimits\!%
\left(z\right)\mathop{{\mathrm{Mc}^{{(3)}}_{{m}}}\/}\nolimits\!\left(z\right),
\mathop{\mathrm{Dc}_{{1}}\/}\nolimits\!\left(n,m,z\right)={\mathop{{\mathrm{Mc%
}^{{(3)}}_{{n}}}\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{Mc}^{%
{(4)}}_{{m}}}\/}\nolimits\!\left(z\right)-{\mathop{{\mathrm{Mc}^{{(4)}}_{{n}}}%
\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{Mc}^{{(3)}}_{{m}}}\/}%
\nolimits\!\left(z\right),
28.28.40
\mathop{\mathrm{Dsc}_{{0}}\/}\nolimits\!\left(n,m,z\right)=\mathop{{\mathrm{Ms%
}^{{(3)}}_{{n}}}\/}\nolimits\!\left(z\right)\mathop{{\mathrm{Mc}^{{(4)}}_{{m}}%
}\/}\nolimits\!\left(z\right)-\mathop{{\mathrm{Ms}^{{(4)}}_{{n}}}\/}\nolimits%
\!\left(z\right)\mathop{{\mathrm{Mc}^{{(3)}}_{{m}}}\/}\nolimits\!\left(z\right),
\mathop{\mathrm{Dsc}_{{1}}\/}\nolimits\!\left(n,m,z\right)={\mathop{{\mathrm{%
Ms}^{{(3)}}_{{n}}}\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{Mc}%
^{{(4)}}_{{m}}}\/}\nolimits\!\left(z\right)-{\mathop{{\mathrm{Ms}^{{(4)}}_{{n}%
}}\/}\nolimits^{{\prime}}}\!\left(z\right)\mathop{{\mathrm{Mc}^{{(3)}}_{{m}}}%
\/}\nolimits\!\left(z\right).

Then

where m-n=2p+1, p\in\Integer; m=0,1,2,\dots, n=1,2,3,\dots. Also,

§28.28(v) Compendia

See Prudnikov et al. (1990, pp. 359–368), Gradshteyn and Ryzhik (2000, pp. 755–759), Sips (1970), and Meixner et al. (1980, §2.1.1).