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7.17.4 Ei_3(x)

Function: double gsl_sf_expint_3 (double x)

Function: int gsl_sf_expint_3_e (double x, gsl_sf_result * result)

These routines compute the third-order exponential integral Ei_3(x) = \int_0^xdt \exp(-t^3) for x >= 0.