Integral de Goodwin-Staton

En matemáticas, la integral de Goodwin-Staton se define como: ^[1]

${\displaystyle G(z)=\int _{0}^{\infty }{\frac {e^{-t^{2}}}{t+z}}\,dt}$

Satisface la siguiente ecuación diferencial no lineal de tercer orden :

${\displaystyle 4w(z)+8\,z{\frac {d}{dz}}w(z)+(2+2\,z^{2}){\frac {d^{2}}{dz^{2}}}w(z)+z{\frac {d^{3}}{dz^{3}}}w\left(z\right)=0}$

Propiedades

Simetría:

${\displaystyle G(-z)=-G(z)}$

Expansión para z pequeña :

${\displaystyle {\begin{aligned}G(z)={}&1-\gamma -\ln(z^{2})-i\operatorname {csgn} (iz^{2})\pi +{\frac {2i}{\sqrt {\pi }}}z\\[5pt]&\qquad {}+(-2+\gamma +\ln(z^{2})+i\operatorname {csgn} (iz^{2})\pi {\Big )}z^{2}-{\frac {4i}{3{\sqrt {\pi }}}}z^{3}\\[5pt]&\qquad {}+\left({\frac {5}{4}}-{\frac {1}{2}}\gamma -{\frac {1}{2}}\ln(z^{2})-{\frac {1}{2}}i\operatorname {csgn} (iz^{2})\pi \right)z^{4}+O(z^{5})\end{aligned}}}$

Referencias

1. Frank William John Olver (ed.), NM Temme (contr. del capítulo), NIST Handbook of Mathematical Functions, Capítulo 7, pág. 160, Cambridge University Press 2010

• http://journals.cambridge.org/article_S0013091504001087
• Mamedov, BA (2007). "Evaluación de la integral generalizada de Goodwin-Staton utilizando el teorema de expansión binomial". Revista de espectroscopia cuantitativa y transferencia radiativa . 105 : 8–11. doi :10.1016/j.jqsrt.2006.09.018.
• http://dlmf.nist.gov/7.2
• https://web.archive.org/web/20150225035306/http://discovery.dundee.ac.uk/portal/en/research/the-generalized-goodwinstaton-integral(3db9f429-7d7f-488c-a1d7-c8efffd01158) .html
• https://web.archive.org/web/20150225105452/http://discovery.dundee.ac.uk/portal/en/research/the-generalized-goodwinstaton-integral(3db9f429-7d7f-488c-a1d7-c8efffd01158) /exportar.html
• http://www.damtp.cam.ac.uk/user/na/NA_papers/NA2009_02.pdf
• FWJ Olver , Werner Rheinbolt, Academic Press, 2014, Matemáticas, asintóticas y funciones especiales , 588 páginas, ISBN 9781483267449 gbook