DLMF:

8 Incomplete Gamma and Related Functions Incomplete Gamma Functions 8.3 Graphics 8.3 Graphics 8.4 Special Values

Figure 8.3.14 (See in context.)

Figure 8.3.14: $\mathop{\Gamma\/}\nolimits\!\left(2.5,x+iy\right)$ , $-2.2\leq x\leq 3$ , $-3\leq y\leq 3$ . Principal value. There is a cut along the negative real axis. When

, $\mathop{\Gamma\/}\nolimits\!\left(2.5,0\right)=\mathop{\Gamma\/}\nolimits\!% \left(2.5\right)=1.329\ldots$ .

Annotations:

Symbols:: $\mathop{\Gamma\/}\nolimits\!\left(z\right)$ : gamma function, $\mathop{\Gamma\/}\nolimits\!\left(a,z\right)$ : incomplete gamma function and : real variable
Permalink:: http://dlmf.nist.gov/8.3.F14.mag
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