DLMF:

Figure 6.3.1 (See in context.)

Figure 6.3.1: The exponential integrals $\mathop{E_{1}\/}\nolimits\!\left(x\right)$ and $\mathop{\mathrm{Ei}\/}\nolimits\!\left(x\right)$ , $0<x\leq 2$ .

Annotations:

Symbols:: $\mathop{E_{1}\/}\nolimits\!\left(z\right)$ : exponential integral, $\mathop{\mathrm{Ei}\/}\nolimits\!\left(x\right)$ : exponential integral and : real variable
Keywords:: exponential integrals
Permalink:: http://dlmf.nist.gov/6.3.F1.mag
Encodings:: Magnified png, pdf