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DLMF: §12.4 Power-Series Expansions ‣ Properties ‣ Chapter 12 Parabolic Cylinder Functions

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12 Parabolic Cylinder Functions Properties 12.3 Graphics 12.5 Integral Representations

§12.4 Power-Series Expansions

ⓘ

Keywords:: parabolic cylinder functions, power-series expansions
Notes:: See Miller (1955, pp. 61–63).
Permalink:: http://dlmf.nist.gov/12.4
See also:: Annotations for Ch.12

12.4.1		$U\left(a,z\right)=U\left(a,0\right)u_{1}(a,z)+U'\left(a,0\right)u_{2}(a,z),$
ⓘ Symbols: $U\left(\NVar{a},\NVar{z}\right)$ : parabolic cylinder function, $z$ : complex variable, $a$ : real or complex parameter, $u_{1}(a,z)$ : solution and $u_{2}(a,z)$ : solution Referenced by: §12.20 Permalink: http://dlmf.nist.gov/12.4.E1 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

12.4.2		$V\left(a,z\right)=V\left(a,0\right)u_{1}(a,z)+V'\left(a,0\right)u_{2}(a,z),$
ⓘ Symbols: $V\left(\NVar{a},\NVar{z}\right)$ : parabolic cylinder function, $z$ : complex variable, $a$ : real or complex parameter, $u_{1}(a,z)$ : solution and $u_{2}(a,z)$ : solution Referenced by: §12.20 Permalink: http://dlmf.nist.gov/12.4.E2 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

where the initial values are given by (12.2.6)–(12.2.9), and $u_{1}(a,z)$ and $u_{2}(a,z)$ are the even and odd solutions of (12.2.2) given by

12.4.3		$u_{1}(a,z)=e^{-\tfrac{1}{4}z^{2}}\left(1+(a+\tfrac{1}{2})\frac{z^{2}}{2!}+(a+% \tfrac{1}{2})(a+\tfrac{5}{2})\frac{z^{4}}{4!}+\cdots\right),$
ⓘ Defines: $u_{1}(a,z)$ : solution (locally) Symbols: $\mathrm{e}$ : base of natural logarithm, $!$ : factorial (as in $n!$ ), $z$ : complex variable and $a$ : real or complex parameter A&S Ref: 19.2.1 (modification of) Referenced by: §12.14(v), §12.7(iv) Permalink: http://dlmf.nist.gov/12.4.E3 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

12.4.4		$u_{2}(a,z)=e^{-\tfrac{1}{4}z^{2}}\left(z+(a+\tfrac{3}{2})\frac{z^{3}}{3!}+(a+% \tfrac{3}{2})(a+\tfrac{7}{2})\frac{z^{5}}{5!}+\cdots\right).$
ⓘ Defines: $u_{2}(a,z)$ : solution (locally) Symbols: $\mathrm{e}$ : base of natural logarithm, $!$ : factorial (as in $n!$ ), $z$ : complex variable and $a$ : real or complex parameter A&S Ref: 19.2.3 (modification of) Permalink: http://dlmf.nist.gov/12.4.E4 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

Equivalently,

12.4.5		$u_{1}(a,z)=e^{\tfrac{1}{4}z^{2}}\left(1+(a-\tfrac{1}{2})\frac{z^{2}}{2!}+(a-% \tfrac{1}{2})(a-\tfrac{5}{2})\frac{z^{4}}{4!}+\cdots\right),$
ⓘ Symbols: $\mathrm{e}$ : base of natural logarithm, $!$ : factorial (as in $n!$ ), $z$ : complex variable, $a$ : real or complex parameter and $u_{1}(a,z)$ : solution A&S Ref: 19.2.2 (modification of) Permalink: http://dlmf.nist.gov/12.4.E5 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

12.4.6		$u_{2}(a,z)=e^{\tfrac{1}{4}z^{2}}\left(z+(a-\tfrac{3}{2})\frac{z^{3}}{3!}+(a-% \tfrac{3}{2})(a-\tfrac{7}{2})\frac{z^{5}}{5!}+\cdots\right).$
ⓘ Symbols: $\mathrm{e}$ : base of natural logarithm, $!$ : factorial (as in $n!$ ), $z$ : complex variable, $a$ : real or complex parameter and $u_{2}(a,z)$ : solution A&S Ref: 19.2.4 (modification of) Referenced by: §12.14(v), §12.7(iv) Permalink: http://dlmf.nist.gov/12.4.E6 Encodings: TeX, pMML, png See also: Annotations for §12.4 and Ch.12

These series converge for all values of $z$ .

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