DLMF:

8 Incomplete Gamma and Related Functions Related Functions 8.19 Generalized Exponential Integral 8.19 Generalized Exponential Integral 8.20 Asymptotic Expansions of $\mathop{E_{{p}}\/}\nolimits\!\left(z\right)$

Figure 8.19.3 (See in context.)

Figure 8.19.3: $\mathop{E_{{1}}\/}\nolimits\!\left(x+iy\right)$ , $-4\leq x\leq 4$ , $-4\leq y\leq 4$ . Principal value. There is a branch cut along the negative real axis.

Annotations:

Symbols:: $\mathop{E_{{p}}\/}\nolimits\!\left(z\right)$ : generalized exponential integral and : real variable
Permalink:: http://dlmf.nist.gov/8.19.F3.mag
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© 2010–2013 NIST / Privacy Policy / Disclaimer / Feedback; Version 1.0.6; Release date 2013-05-06 Math-Image version (See MathML) . A Printed Companionis available. 8.19 Generalized Exponential Integral 8.20 Asymptotic Expansions of $\mathop{E_{{p}}\/}\nolimits\!\left(z\right)$